'Endangered' definitions:

Definition of 'endangered'

adjective

(of flora or fauna) in imminent danger of extinction; "an endangered species"

From: GCIDE

Endanger \En*dan"ger\, v. t. [imp. & p. p. Endangered; p. pr. & vb. n. Endangering.]
1. To put to hazard; to bring into danger or peril; to expose to loss or injury; as, to endanger life or peace. [1913 Webster]
All the other difficulties of his reign only exercised without endangering him. --Burke. [1913 Webster]
2. To incur the hazard of; to risk. [Obs.] [1913 Webster]
He that turneth the humors back . . . endangereth malign ulcers. --Bacon. [1913 Webster]

From: GCIDE

endangered \en*dan"gered\, a.
1. Being in a condition or situation where life or serious harm is possible; in danger; at risk. [PJC]
2. Small in numbers, with significant possibility of extinction; -- of species. [PJC]