tropic

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See also: -tropic

English[edit]

Alternative forms[edit]

Etymology[edit]

From Late Latin tropicus (of or pertaining to the solstice, as a noun, one of the tropics), from Ancient Greek τροπικός (tropikós, of or pertaining to a turn or change; or the solstice; or a trope or figure; tropic; tropical; etc.), from τροπή (tropḗ, turn; solstice; trope); see trope.

Pronunciation[edit]

Noun[edit]

tropic (plural tropics)

  1. Either of the two parallels of latitude 23°27′north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics.

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Adjective[edit]

tropic (comparative more tropic, superlative most tropic)

  1. Of, or relating to the tropics; tropical.
  2. (weather, climate) hot and humid.
  3. (biochemistry) (noncomparative) Having the quality of indirectly inducing a biological or chemical change in a system or substrate.
    The binding of oxygen to hemoglobin is allosterically regulated by various tropic factors, such as BPG and acidity.

Usage notes[edit]

In chemical sense, not to be confused with similar-sounding trophic – the words and concepts are unrelated.[1]

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References[edit]

  1. ^ Trophic vs. Tropic”, Werner Steinberg, JAMA, May 3, 1952, 149(1), p. 82, doi:10.1001/jama.1952.02930180084027.

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