From The Collaborative International Dictionary of English v.0.48 [gcide]:
Jungle \Jun"gle\ (j[u^][ng]"g'l), n. [Hind. jangal desert,
forest, jungle; Skr. ja[.n]gala desert.]
1. A dense growth of brushwood, grasses, reeds, vines, etc.;
an almost impenetrable thicket of trees, canes, and reedy
vegetation, as in India, Africa, Australia, and Brazil.
The jungles of India are of bamboos, canes, and
other palms, very difficult to penetrate. --Balfour
(Cyc. of
India).
[1913 Webster]
2. Hence: (Fig.) A place of danger or ruthless competition
for survival. /'bdIt's a jungle out there./'b8
[PJC]
3. Anything which causes confusion or difficulty due to
intricacy; as, a jungle of environmental regulations.
--MW10.
[PJC]
Jungle bear (Zool.), the aswail or sloth bear.
Jungle cat (Zool.), the chaus.
Jungle cock (Zool.), the male of a jungle fowl.
Jungle fowl. (Zool.)
(a) Any wild species of the genus Gallus, of which
several species inhabit India and the adjacent
islands; as, the fork-tailed jungle fowl ({Gallus
varius}) of Java, Gallus Stanleyi of Ceylon, and
Gallus Bankiva of India.
Note: The latter, which resembles the domestic gamecock, is
supposed to be one of the original species from which
the domestic fowl was derived.
(b) An Australian grallatorial bird (Megapodius tumulus)
which is allied to the brush turkey, and, like the
latter, lays its eggs in mounds of vegetable matter,
where they are hatched by the heat produced by
decomposition.
[1913 Webster]