Source : Webster's Revised Unabridged Dictionary (1913)

Subtropical \Sub*trop"ic*al\, a.
   Nearly tropical.

Source : WordNet®

subtropical
     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: {subtropic},
            {semitropical}, {semitropic}]