(biology) A species which is in danger of becoming extinct throughout all or a significant portion of its range. / A class or kind whose continued existence is threatened.

(transitive) To put (someone or something) in danger; to risk causing harm to. / (obsolete, transitive) To incur the hazard of; to risk; to run the risk of.

(chemistry) Of a chemical reaction that absorbs heat energy from its surroundings. / (zoology) Of an animal whose body temperature is regulated by internal factors.

(anatomy) The mucous membrane that lines the uterus in mammals and in which fertilized eggs are implanted.

(chiefly US) An endowed faculty position which is supported by the annual payout from a privately funded endowment. The endowment may cover the faculty salary, research and travel stipends or other associated costs and continues in perpetuity.

In an endless manner; continuously without limit.

plural of endowed chair

(chess) The final stage of a game of chess, when there are few pieces left. / (bridge) The final stage of a game of bridge, when there are few cards left. / (by extension) The final stage of any game.

(fandom slang, of a ship) Having become canon by the end of the plot of a work of fiction or speculated to be intended to become such.

plural of term of endearment