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See also: Tropic and -tropic


Alternative forms[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).



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.

Derived terms[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]


Derived terms[edit]

Related terms[edit]


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

Further reading[edit]