From Late Latin tropicus (“of or pertaining to the solstice, as a noun, one of the tropics”), from τροπικός (tropikós, “of or pertaining to a turn or change, or the solstice, or a trope or figure, tropic, tropical; etc.”), from τροπή (tropē, “a turn, turning, solstice, trope”); see trope.
- Rhymes: -ɒpɪk
tropic (plural tropics)
- 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.
- Of, or relating to the tropics; tropical.
- (weather, climate) hot and humid.
- (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.
- tropic in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- tropic in The Century Dictionary, The Century Co., New York, 1911
- tropic at OneLook Dictionary Search