Glossary of terms used on this site

Glossary of biology.

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Glossaries

Term Main definition
nacre
Glossaries - Biology glossary

calcareous secretion produced by bivalves to line the inner side of shells as well as to coat intruding particulate matter

nasal cavity
Glossaries - Biology glossary

opening of the respiratory system to the outside environment

natural killer (NK) cell
Glossaries - Biology glossary

lymphocyte that can kill cells infected with viruses or tumor cells

natural science
Glossaries - Biology glossary

field of science that is related to the physical world and its phenomena and processes

natural selection
Glossaries - Biology glossary

reproduction of individuals with favorable genetic traits that survive environmental change because of those traits, leading to evolutionary change

nauplius
Glossaries - Biology glossary

larval stage in the early development of crustaceans

nectar
Glossaries - Biology glossary

liquid rich in sugars produced by flowers to attract animal pollinators

nectar guide
Glossaries - Biology glossary

pigment pattern on a flower that guides an insect to the nectaries

negative feedback loop
Glossaries - Biology glossary

feedback to a control mechanism that increases or decreases a stimulus instead of maintaining it

negative gravitropism
Glossaries - Biology glossary

growth away from Earth’s gravity

negative polarity
Glossaries - Biology glossary

ssRNA viruses with genomes complementary to their mRNA

nematocyst
Glossaries - Biology glossary

harpoon-like organelle within cnidocyte with pointed projectile and poison to stun and entangle prey

Nematoda
Glossaries - Biology glossary

phylum of worm-like animals that are triploblastic, pseudocoelomates that can be free-living or parasitic

Nemertea
Glossaries - Biology glossary

phylum of dorsoventrally flattened protostomes known as ribbon worms

Neognathae
Glossaries - Biology glossary

birds other than the Paleognathae

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