Of, relating to, or being the geographic areas adjacent to the Tropics. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "subtropical" in a sentence
"I don't have a flag to fly on national holidays, and the most I'll do for Christmas is a wreath on the door because it has good memories and the scent of pine is rare in subtropical Florida."
"(Humidity-triggered bathroom fans, good; a grass roof in subtropical sun, not so good.)"
"Between 1969 and 2000, 85 per cent of lowland and mountain subtropical dry forests has been cleared (1. 2m hectares), according to a Zac (2004)."