All 3 Uses

rainforest
in
The Things They Carried
(Auto-generated)

Secretive and suspicious, loners by nature, the six Greenies would sometimes vanish for days at a time, or even weeks, then late in the night they would just as magically reappear, moving like shadows through the moonlight, filing in silently from the dense rain forest off to the west.†
Chpt 9

rain forest = dense, rainy forest with many species
In the darkness there was that weird tribal music, which seemed to come from the earth itself, from the deep rain forest, and a woman's voice rising up in a language beyond translation.†
Chpt 9 *
Late at night, when the Greenies were out on ambush, the whole rain forest seemed to stare in at them-a watched feeling-and a couple of times they almost saw her sliding through the shadows.†
Chpt 9

Definitions:

(1) (rainforest)
a dense forest with heavy rainfall and high biodiversity -- usually found in warm tropical regions

Rainforests have layered growth (forest floor, understory, canopy, and emergent trees) and support an enormous variety of plants, insects, birds, and mammals. They help regulate climate by storing carbon and cycling water through evaporation and rainfall.
(2) (meaning too rare to warrant focus)