|Noun and adjective.
Rain forest refers to both tropical and
temperate continually moist forests receiving heavy rain each year.
Sources vary as to the amount: not less than 80 inches but usually
nearer 100 or more.
The dim light penetrating the rain forest's canopy limits low-growing, ground-rooted vegetation. Strictly speaking, rain forest is not synonymous with jungle. However, dense
growth does occur along broad rivers and in previously cleared areas
where strong sunlight reaches the ground; these areas may be called jungle.
See also jungle.