Select Page

Archives: Dictionary

Holotype

/ˈhäləˌtīp/  /ˈhōlə-/ Noun, pl. holotypes 1. A single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several such, but explicitly designated as the holotype. (wikipedia.org) 2. The single physical example (or illustration) of an organism, known to be used when the taxon was formally described. (wiktionary.org) 3. A single specimen designated or indicated the type specimen by the original author at the time of publication of the original description. (biology-online.org) 4. A single type specimen upon which the description and name of a new species is based. (Google Dictionary) 5. The original specimen from which the description of a new species is made....

Read More

Homeostasis

Noun 1. The property of a system that regulates its internal environment and tends to maintain a stable, relatively constant condition of properties such as temperature or pH. It can be either an open or closed system. In simple terms, it is basically a process in which the body’s internal environment is kept stable. (wikipedia.org) 2. The processes whereby the internal Environment of an organism tends to remain balanced and stable. (online-medical-dictionary.org) 3. The maintenance of metabolic equilibrium within an animal by a tendency to compensate for disrupting changes. (Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers) 4. The maintenance of equilibrium within a social group, person, etc. (Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers)   adj., homeostatic (-sttk) Word origin: From Greek: ὅμοιος, “hómoios“, “similar”, and στάσις, stásis, “standing...

Read More

Homogeneous

/ˌhōməˈjēnēəs/ Adjective 1. Uniform in composition or character. (wikipedia.org) 2. Of the same kind; alike, similar. (wiktionary.org) 3. Having the same composition throughout; of uniform make-up. (wiktionary.org) 4. (Chemistry) in the same state of matter. (wiktionary.org) 5. (Mathematics) Of which the properties of a smaller set apply to the whole; scalable. (wiktionary.org) 6. Consisting of or composed of similar elements or ingredients, of a uniform quality throughout. (biology-online.org) Word origin: From Medieval Latin homogeneus, from Greek homogenes “of the same kind,” from homos “same” + genos “kind, gender, race, stock”. Earlier in this sense was homogeneal...

Read More

Hormone

Noun 1. A chemical released by a cell, a gland, or an organ in one part of the body that affects cells in other parts of the organism. Generally, only a small amount of hormone is required to alter cell metabolism. In essence, it is a chemical messenger that transports a signal from one cell to another. (wikipedia.org) 2. (Physiology) Any substance produced by one tissue and conveyed by the bloodstream to another to effect physiological activity. (wiktionary.org) 3. (Pharmacology) A synthetic compound with the same activity. (wiktionary.org) 4. A naturally occuring substance secreted by specialised cells that affects the metabolism or behaviour of other cells possessing functional receptors for the hormone. Hormones may be hydrophilic, like insulin, in which case the receptors are on the cell surface or lipophilic, like the steroids, where the receptor can be intracellular. (biology-online.org) 5. A regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action. (Google Dictionary) 6. The secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect. (wordnetweb.princeton.edu) Word origin: From Greek hormon “that which sets in motion,” present participle of horman “impel, urge on,” from horme “onset,...

Read More

Hormone

1. A chemical released by a cell, a gland, or an organ in one part of the body that affects cells in other parts of the organism. Only a small amount of hormone is required to alter cell metabolism. In essence, it is a chemical messenger that transports a signal from one cell to another. (wikipedia.org) 2. (Endocrinology) A naturally occurring substance secreted by specialized cells that affects the metabolism or behavior of other cells possessing functional receptors for the hormone. Hormones may be hydrophilic, like insulin, in which case the receptors are on the cell surface or lipophilic, like the steroids, where the receptor can be intracellular. (biology-online.org) 3. A regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action. (Google Dictionary) 4. (Physiology) Any substance produced by one tissue and conveyed by the bloodstream to another to effect physiological activity. (wiktionary.org) 5. (Pharmacology) A synthetic compound with the same activity. (wiktionary.org) 6. Any similar substance in plants. (wiktionary.org) Word origin: From Greek hormon “that which sets in motion,” present participle of horman “impel, urge on,” from horme “onset, impulse,” from PIE *or-sma-, from root *er- “to move, set in...

Read More
  • 1
  • 2

Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how