tropic

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.

The turning-point; a solstitial point.

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.

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°.

plural With the definite article: the regions lying between the tropics of Cancer and Capricorn, or near them on either side.

Of or pertaining to the tropics; tropical.

any one of three species of oceanic belonging to the genus Phaëthon, found chiefly in tropical seas. They are mostly white, and have two central tail feathers very long and slender. The yellow-billed tropic bird. Phaëthon flavirostris (called also boatswain), is found on the Atlantic coast of America, and is common at the Bermudas, where it breeds.

Of, pertaining to, or designating, an acid obtained from atropine and certain other alkaloids, as a white crystalline substance slightly soluble in water.