Wiktionary
a. Intermediate between temperate and tropical.
WordNet
adj. of or relating to or characteristic of conditions in the subtropics; "even near the equator vegetation at 5000 ft is subtropical rather than tropical" [syn: subtropical, subtropic, semitropic]
Usage examples of "semitropical".
As they picked their way, she taught him how to recognize the trees of the Lacandon rain forest, which was a weird conglomeration of semitropical vegetation coexisting with oak and pine trees.
The fens were a semitropical marsh area consisting mostly of thick chalma growth, weirwood forest, and more temperate stands of giant prometheus in the rocky areas above the floodplain, but during the crisp, dry cold snap of early autumn, the mallards paused there on their migration from the southern islands to their lakes in the remotest regions of the Pinion Plateau.
With an enormous variety of topography and scenery ranging from semitropical vacation planets with white sand beaches and rivieras of colorful flora (Ordu, Andron-icus, and Dragases), dense rain forests and vcee' plantations (Wogoria and Calleri'l), to rugged landscapes of the Voso Triad, gateways of the domain's celecoid quartz kernel growing areas, linchpins of Fluvannian economic life.