pluv-, pluvio-, pluvi-

(Latin: rain, raining, rain water, rainy; rain fall; heavy showers)

pluvisylva, pluvisilva (s) (noun); pluvisylvas, pluvisilvas (pl)
A forest that exists in exceedingly humid areas in which the trees grow with great density: When Mrs. Owen was teaching her class about the tropics, the students were very interested in the pluvisylvas needing constant moisture from the atmosphere in order to exist.

Rain forests are often, but not always, located in tropical regions.