Meaning: The egg of a louse or other parasitic insect.

Part of speech: noun

Example: She found a nit in her daughter's hair.

Category: Biology › Entomology

Meaning: Not human; relating to animals or machines.

Part of speech: adjective

Example: The study focuses on non-human primates.

Category: Biology

Synonyms:

• animal
• mechanical

Antonyms: human

Meaning: Biomolecules essential for all known forms of life, including DNA and RNA.

Part of speech: noun

Example: Nucleic acids are crucial for genetic information.

Category: Biology

Synonyms:

• DNA
• RNA

Meaning: The children or young of a particular parent or species.

Part of speech: noun

Example: The bird fed its offspring in the nest.

Category: Biology › Reproduction

Synonyms:

• young
• descendants

Meaning: Eating both plants and animals.

Part of speech: adjective

Example: Humans are omnivorous, consuming a variety of foods.

Category: Biology

Synonyms:

• mixed-diet
• all-eating

Antonyms:

• herbivorous
• carnivorous

Meaning: The plural of ovum; female reproductive cells.

Part of speech: noun

Example: The scientist studied the development of the ova.

Category: Biology › Reproductive Biology

Meaning: The female reproductive organ that produces eggs.

Part of speech: noun

Example: The ovary releases an egg during ovulation.

Category: Biology › Reproductive Biology

Meaning: To release an egg from the ovary.

Part of speech: verb

Example: Women ovulate approximately once a month.

Category: Biology › Reproductive System

Synonyms: release an egg

Meaning: A female reproductive cell or egg.

Part of speech: noun

Example: The ovum is fertilized by a sperm cell.

Category: Biology › Reproductive System

Synonyms: egg

Meaning: An organism that lives on or in a host and gets its food at the host's expense.

Part of speech: noun

Example: The tick is a common parasite found on animals.

Category: Biology › Ecology

Synonyms:

• leech
• freeloader

Meaning: Relating to or characteristic of a parasite.

Part of speech: adjective

Example: Parasitic infections can be harmful to health.

Category: Biology › Ecology

Meaning: A chemical substance produced by an animal that influences the behavior of others of its species.

Part of speech: noun

Example: Ants use pheromones to communicate with each other.

Category: Biology › Chemistry

Meaning: A tiny opening in the skin or a surface.

Part of speech: noun

Example: The skin has many pores that can get clogged.

Category: Biology › Anatomy

Synonyms:

• opening
• hole

Meaning: A member of the order of mammals that includes humans, apes, and monkeys.

Part of speech: noun

Example: Humans are classified as primates.

Category: Biology › Zoology

Synonyms: ape

Meaning: To produce offspring; to reproduce.

Part of speech: verb

Example: Many species procreate in the spring.

Category: Biology › Reproduction

Synonyms:

• reproduce
• breed

Antonyms:

• sterilize
• prevent

Meaning: an animal with four legs

Part of speech: noun

Example: Dogs and cats are both quadrupeds.

Category: Biology › Zoology

Meaning: an extinct species of zebra

Part of speech: noun

Example: The quagga was native to South Africa.

Category: Biology › Extinct Species

Meaning: One of five offspring born at the same time.

Part of speech: noun

Example: The quintuplet babies were a surprise to the family.

Category: Biology

Synonyms: five siblings

Meaning: A cell or organ that responds to stimuli.

Part of speech: noun

Example: The receptor detects changes in the environment.

Category: Biology

Synonyms:

• sensor
• detector

Meaning: Relating to a trait that is not expressed when a dominant trait is present.

Part of speech: adjective

Example: The recessive gene can be passed down through generations.

Category: Biology › Genetics

Synonyms:

• hidden
• latent

Antonyms:

• dominant
• expressed

Meaning: To bring swallowed food back to the mouth.

Part of speech: verb

Example: The bird regurgitates food for its young.

Category: Biology

Synonyms:

• vomit
• bring up

Meaning: The process of breathing.

Part of speech: noun

Example: Respiration is essential for life.

Category: Biology › Physiology

Synonyms:

• breathing
• inhale-exhale

Meaning: Covered with scales; rough or flaky.

Part of speech: adjective

Example: The fish had a scaly texture.

Category: Biology

Synonyms:

• rough
• flaky

Meaning: To produce and release a substance, often in a biological context.

Part of speech: verb

Example: The glands secrete hormones into the bloodstream.

Category: Biology

Synonyms:

• produce
• release

Meaning: The process of producing and releasing a substance, often in a biological context.

Part of speech: noun

Example: The secretion of saliva helps with digestion.

Category: Biology

Synonyms:

• release
• production

Meaning: The fluid containing sperm that is released during ejaculation.

Part of speech: noun

Example: Semen is essential for reproduction.

Category: Biology › Reproduction

Synonyms: sperm fluid

Meaning: The outer covering of a person or animal.

Part of speech: noun

Example: He has sensitive skin.

Category: Biology

Synonyms:

• dermis
• epidermis

Antonyms:

• flesh
• muscle

Meaning: A type of lizard.

Part of speech: noun

Example: The skink is known for its smooth scales.

Category: Biology › Zoology

Synonyms: lizard

Meaning: The bony structure of the head that encloses the brain.

Part of speech: noun

Example: The skull protects the brain from injury.

Category: Biology › Anatomy

Synonyms:

• cranium
• head

Meaning: A small black and white mammal known for its strong odor.

Part of speech: noun

Example: The skunk sprayed a foul smell.

Category: Biology › Zoology

Synonyms: polecat

Meaning: Involuntary muscle found in internal organs.

Part of speech: noun

Example: Smooth muscle helps move food through the digestive system.

Category: Biology

Synonyms:

• involuntary muscle
• non-striated muscle

Meaning: The male reproductive cell in animals.

Part of speech: noun

Example: Sperm is necessary for fertilization.

Category: Biology › Reproduction

Synonyms: spermatozoon

Meaning: A mature male reproductive cell, or sperm cell.

Part of speech: noun

Example: The spermatozoon travels to fertilize the egg.

Category: Biology › Reproduction

Synonyms: sperm

Meaning: Having a sponge-like structure.

Part of speech: adjective

Example: The spongi form of the coral is fascinating.

Category: Biology

Synonyms: sponge-like

Meaning: The underlying layer or substance in which something is embedded or grows.

Part of speech: noun

Example: The substrate is essential for plant growth.

Category: Biology

Synonyms:

• foundation
• base

Meaning: a relationship between two different organisms that benefits both

Part of speech: noun

Example: The symbiosis between bees and flowers is essential for pollination.

Category: Biology

Synonyms: mutualism

Meaning: A sensory structure on the tongue that detects taste.

Part of speech: noun

Example: Tastebuds help us enjoy different flavors in food.

Category: Biology › Human Anatomy

Meaning: The nipple of a female mammal, from which milk is produced.

Part of speech: noun

Example: The calf drank milk from its mother's teat.

Category: Biology › Anatomy

Synonyms: nipple

Meaning: a long, flexible limb of an animal, often used for feeling or grasping

Part of speech: noun

Example: The octopus has eight tentacles.

Category: Biology › Zoology

Synonyms:

• appendage
• limb

Meaning: an insect that feeds on wood

Part of speech: noun

Example: Termites can cause significant damage to buildings.

Category: Biology › Entomology

Synonyms:

• pest
• insect