tropical UK /ˈtɹɒp.ɪ.kəl/US /ˈtɹoʊ.pɪ.kəl/adjective 4noun 1forms 3 adjective4 •Of or pertaining to the tropics, the equatorial region between 23 degrees north and 23 degrees south. •From, or similar to, a hot, humid climate.We've had a lot of tropical nights this summer.My favorite tropical fruits are pineapples and coconuts. •Pertaining to tropical geometry. •(old-fashioned) Pertaining to, involving, or of the nature of a trope or tropes; figurative, metaphorical.The foundation of all parables is some analogy or similitude between the tropical or allusive part of the parable and the thing intended by it. — 1692 noun1 •A tropical plant.The potato, as a mountain tropical plant, is capable of growing in cooler weather than any other tropical except the Nasturtian. — 1856 formstropicals · more tropical · most tropical