Error
  • The template for this display is not available. Please contact a Site administrator.

Glossary of terms used on this site

Glossary of biology.

Search for glossary terms (regular expression allowed)

Glossaries

Term Main definition
Hylonomus
Glossaries - Biology glossary

one of the earliest reptiles

Hylonomus
Glossaries - Biology glossary

one of the earliest reptiles

hyoid bone
Glossaries - Biology glossary

lies below the mandible in the front of the neck

hyperextension
Glossaries - Biology glossary

extension past the regular anatomical position

hyperglycemia
Glossaries - Biology glossary

high blood sugar level

hyperopia
Glossaries - Biology glossary

(also, farsightedness) visual defect in which the image focus falls behind the retina, thereby making images in the distance clear, but close-up images blurry

hyperplasia
Glossaries - Biology glossary

abnormally high cell growth and division

hyperpolarization
Glossaries - Biology glossary

change in the membrane potential to a more negative value

hypersensitivities
Glossaries - Biology glossary

spectrum of maladaptive immune responses toward harmless foreign particles or self antigens; occurs after tissue sensitization and includes immediate-type (allergy), delayed-type, and autoimmunity

hyperthermophile
Glossaries - Biology glossary

organism that grows at temperatures between 80–122 °C

hyperthyroidism
Glossaries - Biology glossary

overactivity of the thyroid gland

hypha
Glossaries - Biology glossary

fungal filament composed of one or more cells

hypocotyl
Glossaries - Biology glossary

embryonic axis above the cotyledons

hypoglycemia
Glossaries - Biology glossary

low blood sugar level

hypophyseal portal system
Glossaries - Biology glossary

system of blood vessels that carries hormones from the hypothalamus to the anterior pituitary