Meaning: The soft substance consisting of muscle and fat that is found between the skin and bones of an animal or human.

Part of speech: noun

Example: The flesh of the fruit was sweet and juicy.

Category: Biology

Synonyms:

• meat
• muscle

Antonyms:

• bone
• skin

Meaning: Having a lot of flesh; plump.

Part of speech: adjective

Example: The fleshy fruit was ripe and ready to eat.

Category: Biology

Synonyms:

• plump
• succulent

Antonyms:

• skinny
• thin

Meaning: Unable to fly.

Part of speech: adjective

Example: Penguins are flightless birds.

Category: Biology

Synonyms: grounded

Antonyms: flying

Meaning: A broad, flat limb used for swimming, especially in aquatic animals.

Part of speech: noun

Example: The dolphin used its flipper to steer through the water.

Category: Biology

Synonyms: fin

Meaning: having pure or complete ancestry

Part of speech: adjective

Example: He is a full-blooded member of the tribe.

Category: Biology

Synonyms:

• purebred
• thoroughbred

Antonyms:

• mixed
• crossbred

Meaning: A reproductive cell, such as a sperm or egg.

Part of speech: noun

Example: The fertilization occurs when a sperm gamete meets an egg gamete.

Category: Biology › Reproduction

Synonyms: reproductive cell

Meaning: a thin strand that grows from the skin of humans and animals

Part of speech: noun

Example: She has long, beautiful hair.

Category: Biology › Anatomy

Synonyms:

• strand
• lock

Meaning: lacking hair

Part of speech: adjective

Example: The hairless cat is quite unique.

Category: Biology › Anatomy

Synonyms:

• bald
• smooth

Antonyms:

• hairy
• furry

Meaning: the edge of hair on the forehead

Part of speech: noun

Example: His hairline is receding.

Category: Biology › Anatomy

Synonyms:

• hair margin
• forehead edge

Meaning: an organism that has both male and female reproductive organs

Part of speech: noun

Example: Some plants are hermaphrodites, producing both pollen and ovules.

Category: Biology

Synonyms: bisexual organism

Meaning: Located at the back or rear.

Part of speech: adjective

Example: The hind legs of the animal were strong.

Category: Biology › Anatomy

Synonyms: rear

Antonyms: front

Meaning: The back part of an animal's body, especially the hind legs and hips.

Part of speech: noun

Example: The horse kicked with its hindquarters.

Category: Biology › Anatomy

Synonyms: rear end

Meaning: Having a lot of hair.

Part of speech: adjective

Example: The hirsute man had a thick beard.

Category: Biology › Anatomy

Synonyms: hairy

Antonyms: bald

Meaning: A member of the species Homo sapiens; a person.

Part of speech: noun

Example: Every human has the right to live freely.

Category: Biology

Synonyms: person

Meaning: A person; an individual of the species Homo sapiens.

Part of speech: noun

Example: Every human being deserves respect.

Category: Biology

Synonyms: individual

Meaning: All human beings collectively; humanity.

Part of speech: noun

Example: The human race must work together to solve global issues.

Category: Biology

Synonyms: humankind

Meaning: The human species; all human beings collectively.

Part of speech: noun

Example: Humankind has made great advances in technology.

Category: Biology

Synonyms: mankind

Meaning: To make pregnant; to fertilize an egg.

Part of speech: verb

Example: The male animal can impregnate the female.

Category: Biology

Synonyms:

• fertilize
• inseminate

Antonyms:

• sterilize
• infertile

Meaning: The internal organs of a body.

Part of speech: noun

Example: The chef prepared the innards for the dish.

Category: Biology

Synonyms:

• guts
• entrails

Meaning: Inborn; natural.

Part of speech: adjective

Example: She has an innate talent for music.

Category: Biology

Synonyms:

• inborn
• natural

Antonyms:

• acquired
• learned

Meaning: An innate, typically fixed pattern of behavior in animals in response to certain stimuli.

Part of speech: noun

Example: Birds have a strong instinct to migrate.

Category: Biology

Synonyms:

• intuition
• gut feeling

Antonyms:

• reason
• logic

Meaning: Relating to or prompted by instinct; natural or automatic.

Part of speech: adjective

Example: His instinctive reaction was to run.

Category: Biology

Synonyms:

• intuitive
• natural

Antonyms:

• learned
• acquired

Meaning: Relating to instinct; automatic or natural behavior.

Part of speech: adjective

Example: The instinctual response to danger is to flee.

Category: Biology

Synonyms:

• innate
• natural

Antonyms:

• learned
• acquired

Meaning: The colored part of the eye that controls the size of the pupil.

Part of speech: noun

Example: Her iris was a striking shade of green.

Category: Biology

Synonyms:

• eye color
• pupil control

Meaning: the process of breaking down molecules in the body

Part of speech: noun

Example: Katabolism is essential for energy production.

Category: Biology › Metabolism

Meaning: Having a specified number or type of limbs.

Part of speech: adjective

Example: The creature was described as a four-limbed animal.

Category: Biology › Anatomy

Meaning: A small to medium-sized reptile with a long body and tail, often found in warm regions.

Part of speech: noun

Example: The lizard basked in the sun on the rock.

Category: Biology › Zoology

Synonyms: reptile

Meaning: A domesticated South American animal similar to a camel, used as a pack animal.

Part of speech: noun

Example: The llama carried supplies up the mountain.

Category: Biology › Zoology

Synonyms: camelid

Meaning: The ability to move from one place to another.

Part of speech: noun

Example: Locomotion is essential for animals to find food.

Category: Biology

Synonyms: movement

Meaning: A type of grasshopper that can swarm and cause significant agricultural damage.

Part of speech: noun

Example: The locusts destroyed the crops in the region.

Category: Biology › Entomology

Synonyms: grasshopper

Meaning: relating to the sex that produces sperm

Part of speech: adjective

Example: He is a male lion.

Category: Biology

Synonyms:

• masculine
• manly

Antonyms:

• female
• feminine

Meaning: a warm-blooded animal with hair or fur

Part of speech: noun

Example: Humans are mammals.

Category: Biology

Synonyms:

• animal
• creature

Meaning: relating to mammals

Part of speech: adjective

Example: Mammalian features include hair and warm blood.

Category: Biology

Synonyms:

• mammal-like
• animal

Meaning: relating to the glands that produce milk

Part of speech: adjective

Example: Mammary glands are important for feeding infants.

Category: Biology

Synonyms:

• milk-producing
• lactating

Meaning: an adult male human

Part of speech: noun

Example: He is a man of great integrity.

Category: Biology

Synonyms:

• male
• gentleman

Antonyms:

• woman
• female

Meaning: A pigment responsible for the color of skin, hair, and eyes.

Part of speech: noun

Example: Melanin protects the skin from UV rays.

Category: Biology › Genetics

Synonyms: pigment

Meaning: A thin layer of tissue that covers or separates organs.

Part of speech: noun

Example: The cell membrane controls what enters and exits the cell.

Category: Biology › Anatomy

Synonyms:

• tissue
• layer

Meaning: relating to imitation

Part of speech: adjective

Example: The mimetic behavior of some animals helps them survive.

Category: Biology › Behavior

Synonyms: imitative

Meaning: the action of imitating someone or something

Part of speech: noun

Example: Mimicry is common in the animal kingdom.

Category: Biology › Behavior

Synonyms:

• imitation
• copying

Meaning: The opening in the face used for eating and speaking.

Part of speech: noun

Example: She opened her mouth to speak.

Synonyms:

• oral cavity
• opening