Meaning: Relating to the sun.

Part of speech: adjective

Example: Solar energy is a renewable resource.

Category: Science › Energy

Synonyms: sun-related

Meaning: The collection of planets and other celestial bodies that orbit the sun.

Part of speech: noun

Example: Earth is part of the solar system.

Category: Science › Astronomy

Synonyms: cosmic system

Meaning: The time it takes for the Earth to complete one orbit around the sun.

Part of speech: noun

Example: A solar year is approximately 365.25 days.

Category: Science › Astronomy

Synonyms: tropical year

Meaning: A state of matter characterized by structural rigidity and resistance to changes in shape.

Part of speech: noun

Example: Solid state physics studies the properties of solid materials.

Category: Science › Physics

Synonyms: solid form

Meaning: To make something solid or firm.

Part of speech: verb

Example: The cold weather will solidify the water into ice.

Category: Science

Synonyms:

• harden
• freeze

Meaning: The quality of being solid or firm.

Part of speech: noun

Example: The solidity of the structure was impressive.

Category: Science

Synonyms:

• firmness
• stability

Meaning: In a firm or stable manner.

Part of speech: adverb

Example: The building was solidly constructed.

Category: Science

Synonyms:

• firmly
• stably

Meaning: The time when the sun reaches its highest or lowest point in the sky.

Part of speech: noun

Example: The summer solstice is the longest day of the year.

Category: Science › Astronomy

Synonyms: seasonal event

Meaning: Able to be dissolved in a liquid.

Part of speech: adjective

Example: Salt is soluble in water.

Category: Science › Chemistry

Synonyms: dissolvable

Meaning: A mixture formed when a substance dissolves in a liquid.

Part of speech: noun

Example: The saltwater solution is used for cooking.

Category: Science › Chemistry

Synonyms:

• mixture
• blend

Meaning: A substance that dissolves another substance.

Part of speech: noun

Example: Water is a common solvent.

Category: Science › Chemistry

Synonyms: dissolver

Meaning: Relating to sound or the speed of sound.

Part of speech: adjective

Example: The sonic waves traveled through the air.

Category: Science › Physics

Synonyms:

• acoustic
• auditory

Meaning: A loud noise caused by the shock wave from an object traveling faster than the speed of sound.

Part of speech: noun

Example: The jet created a sonic boom as it broke the sound barrier.

Category: Science › Physics

Synonyms:

• shock wave
• explosion

Meaning: A black powdery substance produced by burning.

Part of speech: noun

Example: The chimney was covered in soot.

Category: Science › Chemistry

Synonyms:

• smoke residue
• carbon

Meaning: Covered with soot; blackened.

Part of speech: adjective

Example: The sooty walls needed a good cleaning.

Category: Science › Chemistry

Synonyms:

• dirty
• blackened

Meaning: Vibrations that travel through air or another medium and can be heard.

Part of speech: noun

Example: The sound of the waves was soothing.

Category: Science › Physics

Synonyms:

• noise
• audio

Meaning: A systematic change in the pronunciation of a language over time.

Part of speech: noun

Example: The Great Vowel Shift changed the way English vowels were pronounced.

Category: Science › Linguistics

Synonyms:

• phonetic change
• linguistic shift

Meaning: A wave of pressure that travels through air or another medium, allowing sound to be heard.

Part of speech: noun

Example: Sound waves can travel through solids, liquids, and gases.

Category: Science › Physics

Synonyms:

• acoustic wave
• sonic wave

Meaning: The act of measuring the depth of water or the condition of something.

Part of speech: noun

Example: The sounding revealed that the water was deeper than expected.

Category: Science › Oceanography

Synonyms:

• measurement
• depth finding

Meaning: The physical universe beyond the earth's atmosphere.

Part of speech: noun

Example: Astronauts explore space to learn more about the universe.

Category: Science › Astronomy

Synonyms:

• universe
• cosmos

Meaning: An unmanned spacecraft designed to explore outer space.

Part of speech: noun

Example: The space probe sent back valuable data from Mars.

Category: Science › Astronautics

Synonyms:

• spacecraft
• exploration vehicle

Meaning: A spacecraft designed to transport astronauts and cargo to and from space.

Part of speech: noun

Example: The space shuttle launched successfully into orbit.

Category: Science › Astronautics

Synonyms: spacecraft

Meaning: A large spacecraft in orbit where astronauts live and work.

Part of speech: noun

Example: The astronauts conducted experiments aboard the space station.

Category: Science › Astronautics

Synonyms: orbital station

Meaning: A protective suit worn by astronauts in space.

Part of speech: noun

Example: He put on his space suit before stepping outside the spacecraft.

Category: Science › Astronautics

Synonyms: spacesuit

Meaning: An activity where an astronaut exits a spacecraft to work in space.

Part of speech: noun

Example: The astronaut completed a space walk to repair the satellite.

Category: Science › Astronautics

Synonyms: extravehicular activity

Meaning: A female astronaut.

Part of speech: noun

Example: The space woman led the mission to the International Space Station.

Category: Science › Astronautics

Synonyms: female astronaut

Meaning: A vehicle designed for travel or operation in outer space.

Part of speech: noun

Example: The space-craft successfully landed on Mars.

Category: Science › Astronomy

Synonyms:

• space vehicle
• spaceship

Meaning: An astronaut or person who travels in space.

Part of speech: noun

Example: The spaceman shared his experiences from the mission.

Category: Science › Astronautics

Synonyms:

• astronaut
• space traveler

Meaning: A vehicle designed for travel in outer space.

Part of speech: noun

Example: The spaceship launched successfully into orbit.

Category: Science › Astronautics

Synonyms:

• spacecraft
• space vehicle

Meaning: The launch of a spacecraft into space.

Part of speech: noun

Example: The spaceshot was broadcast live around the world.

Category: Science › Astronautics

Synonyms:

• launch
• space launch

Meaning: The four-dimensional continuum of space and time in which events occur.

Part of speech: noun

Example: Einstein's theory of relativity describes the concept of space-time.

Category: Science › Physics

Synonyms: spacetime

Meaning: A small fiery particle or flash of light.

Part of speech: noun

Example: A spark ignited the dry grass.

Category: Science › Physics

Synonyms:

• glimmer
• flash

Meaning: Relating to space or the relationship between objects in space.

Part of speech: adjective

Example: Spatial awareness is important for driving.

Category: Science › Geography

Synonyms: spatially oriented

Meaning: A group of living organisms that can interbreed.

Part of speech: noun

Example: The tiger is an endangered species.

Category: Science › Biology

Synonyms:

• kind
• type

Meaning: The ratio of the density of a substance to the density of a reference substance.

Part of speech: noun

Example: Water has a specific gravity of 1.

Category: Science › Physics

Synonyms: relative density

Meaning: The quality of being specific or precise.

Part of speech: noun

Example: The specificity of the test results was impressive.

Category: Science › Biology

Synonyms:

• precision
• exactness

Meaning: An example or sample of something, often used for study.

Part of speech: noun

Example: The scientist collected a specimen of the plant.

Category: Science › Biology

Synonyms:

• sample
• example

Meaning: Plural of spectrum, referring to a range of different things.

Part of speech: noun

Example: The spectra of light include various colors.

Category: Science › Physics

Synonyms:

• ranges
• varieties

Meaning: Relating to or resembling a spectrum.

Part of speech: adjective

Example: The spectral analysis revealed new information.

Category: Science › Physics

Synonyms:

• ghostly
• ethereal

Meaning: An instrument used to measure properties of light.

Part of speech: noun

Example: The scientist used a spectrometer to analyze the light spectrum.

Category: Science › Physics

Synonyms: light meter