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chaste (adj.)[chaste 词源字典]: c. 1200, "virtuous, pure from unlawful sexual intercourse" (as defined by the Church), from Old French chaste "morally pure" (12c.), from Latin castus "clean, pure, morally pure" (see caste). Transferred sense of "sexually pure" is by 15c., perhaps by influence of chastity, though chaste as a noun meaning "virgin person" is recorded from early 14c. Related: Chastely.[chaste etymology, chaste origin, 英语词源]
salamander (n.): mid-14c., "legendary lizard-like creature that can live in fire," from Old French salamandre "legendary fiery beast," also "cricket" (12c.), from Latin salamandra, from Greek salamandra, probably of eastern origin.

The application in zoology to a tailed amphibian (known natively as an eft or newt) is first recorded 1610s. Aristotle, and especially Pliny, are responsible for the fiction of an animal that thrives in and extinguishes fires. The eft lives in damp logs and secretes a milky substance when threatened, but there is no obvious natural explanation its connection with the myth.

Also used 18c. for "a woman who lives chastely in the midst of temptations" (after Addison), and "a soldier who exposes himself to fire in battle." To rub someone a salamander was a 19c. form of German student drinking toast (einem einen salamander reiben). Related: Salamandrine; salamandroid.