Meaning: A microscopic infectious agent that can replicate only inside living cells.

Part of speech: noun

Example: The flu virus spreads easily in winter.

Category: Science › Biology

Synonyms: pathogen

Meaning: Having a sticky or adhesive quality.

Part of speech: adjective

Example: The viscid substance clung to her fingers.

Category: Science › Chemistry

Synonyms:

• sticky
• glutinous

Meaning: Having a thick, sticky consistency.

Part of speech: adjective

Example: The viscous liquid was hard to pour.

Category: Science › Chemistry

Synonyms:

• thick
• sticky

Meaning: The state of being able to see or be seen.

Part of speech: noun

Example: The fog reduced visibility on the road.

Category: Science › Physics

Synonyms:

• sight
• clarity

Meaning: Able to be seen.

Part of speech: adjective

Example: The stars were visible in the clear night sky.

Category: Science › Physics

Synonyms:

• seen
• observable

Meaning: The ability to see; sight.

Part of speech: noun

Example: His vision improved with glasses.

Category: Science › Optics

Synonyms:

• sight
• eyesight

Meaning: The entire area that can be seen when looking straight ahead.

Part of speech: noun

Example: The doctor tested her visual field during the eye exam.

Category: Science › Optics

Synonyms: field of vision

Meaning: Absolutely necessary or important; essential.

Part of speech: adjective

Example: Water is vital for survival.

Category: Science › Biology

Synonyms:

• essential
• crucial

Meaning: To spoil or impair the quality or efficiency of something.

Part of speech: verb

Example: The error could vitiate the entire experiment.

Category: Science › Chemistry

Synonyms:

• impair
• damage

Meaning: Relating to glass; glassy in appearance.

Part of speech: adjective

Example: The vitreous surface of the sculpture reflected light beautifully.

Category: Science › Materials

Synonyms:

• glassy
• transparent

Meaning: To convert into glass or a glass-like substance.

Part of speech: verb

Example: The intense heat can vitrify the clay.

Category: Science › Materials

Synonyms: glassify

Meaning: In an artificial environment, often used in scientific contexts.

Part of speech: noun

Example: The cells were grown in vitro for research purposes.

Category: Science › Biology

Synonyms: artificial environment

Meaning: A controlled environment for keeping animals or plants for study.

Part of speech: noun

Example: The scientist set up a vivarium to observe the behavior of the frogs.

Category: Science › Biology

Synonyms:

• enclosure
• habitat

Meaning: Giving birth to live young rather than laying eggs.

Part of speech: adjective

Example: Humans are viviparous mammals.

Category: Science › Biology

Synonyms: live-bearing

Antonyms: oviparous

Meaning: In a living organism.

Part of speech: adverb

Example: The experiment was conducted in vivo to observe natural processes.

Category: Science › Biology

Meaning: A unit of electric potential.

Part of speech: noun

Example: The battery provides 12 volts of power.

Category: Science › Physics

Synonyms: volt

Meaning: Easily evaporated at normal temperatures; unstable.

Part of speech: adjective

Example: The volatile substance requires careful handling.

Category: Science › Chemistry

Synonyms:

• unstable
• changeable

Antonyms:

• stable
• constant

Meaning: Relating to or produced by a volcano.

Part of speech: adjective

Example: The volcanic eruption caused widespread destruction.

Category: Science › Geology

Synonyms:

• igneous
• eruptive

Meaning: An opening in the Earth's crust through which lava, ash, and gases erupt.

Part of speech: noun

Example: Mount St. Helens is a famous volcano in the United States.

Category: Science › Geology

Synonyms:

• mountain
• peak

Meaning: The study of volcanoes and volcanic activity.

Part of speech: noun

Example: Volcanology helps us understand the behavior of eruptions.

Category: Science › Geology

Synonyms: volcano science

Meaning: A unit of electric potential.

Part of speech: noun

Example: The device operates at 220 volts.

Category: Science › Physics

Synonyms: volt unit

Meaning: The difference in electric potential between two points.

Part of speech: noun

Example: The voltage in the circuit was too high.

Category: Science › Physics

Synonyms: electric potential

Meaning: The amount of space that a substance occupies.

Part of speech: noun

Example: The volume of the box was too large for the shelf.

Category: Science › Mathematics

Synonyms:

• capacity
• size

Antonyms: smallness

Meaning: A whirling mass of fluid or air, often creating a vacuum.

Part of speech: noun

Example: The tornado formed a powerful vortex.

Category: Science › Physics

Synonyms:

• whirlpool
• spiral

Meaning: treated with heat and sulfur to make rubber stronger

Part of speech: adjective

Example: The tires are made from vulcanized rubber.

Category: Science › Chemistry

Synonyms: hardened

Meaning: the study of volcanoes

Part of speech: noun

Example: Vulcanology helps us understand volcanic eruptions.

Category: Science › Geology

Synonyms: volcanology

Meaning: Having a moderate degree of heat.

Part of speech: adjective

Example: The soup was warm and comforting.

Category: Science › Temperature

Synonyms:

• hot
• tepid

Antonyms:

• cold
• cool

Meaning: The act of making something warm or the process of increasing temperature.

Part of speech: noun

Example: The warming of the planet is a serious issue.

Category: Science

Synonyms:

• heating
• raising

Meaning: The quality of being warm; a moderate degree of heat.

Part of speech: noun

Example: The warmth of the sun felt good on her skin.

Category: Science › Temperature

Synonyms:

• heat
• warmness

Antonyms:

• cold
• chill

Meaning: To bend or twist out of shape.

Part of speech: verb

Example: The heat caused the plastic to warp.

Category: Science

Synonyms:

• distort
• bend

Antonyms:

• straighten
• align

Meaning: Bent or twisted out of shape.

Part of speech: adjective

Example: The warped wood was unusable for construction.

Category: Science

Synonyms:

• distorted
• bent

Antonyms:

• straight
• aligned

Meaning: A clear liquid essential for life.

Part of speech: noun

Example: We need water to survive.

Category: Science › Chemistry

Synonyms:

• H2O
• aqua

Antonyms:

• dryness
• desiccation

Meaning: An ancient device for measuring time using the flow of water.

Part of speech: noun

Example: The water clock was an early invention for keeping time.

Category: Science › Timekeeping

Synonyms: clepsydra

Meaning: The height of water in a container or body of water.

Part of speech: noun

Example: The water level in the lake has risen after the rain.

Category: Science › Hydrology

Synonyms: water height

Meaning: A mark indicating the level of water on a surface.

Part of speech: noun

Example: The water mark on the wall showed how high the flood reached.

Category: Science › Hydrology

Synonyms: water line

Meaning: A unit of power equal to one joule per second.

Part of speech: noun

Example: The light bulb uses 60 watts of electricity.

Category: Science › Physics

Synonyms: power unit

Meaning: The amount of power in watts that an electrical device uses.

Part of speech: noun

Example: The wattage of the microwave is 800 watts.

Category: Science › Physics

Synonyms: power consumption

Meaning: A mathematical equation describing wave behavior.

Part of speech: noun

Example: The wave equation is fundamental in physics.

Category: Science › Physics

Synonyms: wave function

Meaning: The distance between successive peaks of a wave.

Part of speech: noun

Example: Different colors of light have different wave lengths.

Category: Science › Physics

Synonyms: wavelengths

Meaning: A small wave, often used in signal processing.

Part of speech: noun

Example: The wave let is useful in analyzing signals.

Category: Science › Mathematics

Synonyms: wavelet