Related to tropine.
Pertaining to or of the nature of the growing, bending, or moving of organisms in relation to external agents; exhibiting tropism.
Pertaining to the tropics (the regions so called); tropical.
noun.
The turning-point; a solstitial point.
noun.
In astronomy, one of two circles on the celestial sphere whose distances from the equator are each equal to the obliquity of the ecliptic, or 23½° nearly.
noun.
In geography, one of two parallels of latitude, each at the same distance from the terrestrial equator as the celestial tropics are from the celestial equator—that is, about 23½°.
noun.
plural With the definite article: the regions lying between the tropics of Cancer and Capricorn, or near them on either side.