Word Origin & History
salient1562, "leaping," a heraldic term, from L. salientem (nom. saliens), prp. of salire "to leap," from PIE base *sel- "to jump" (cf. Gk. hallesthai "to leap," M.Ir. saltraim "I trample," and probably Skt. ucchalati "rises quickly"). The meaning "pointing outward" (preserved in military usage) is from 1687;
that of "prominent, striking" first recorded 1840, from salient point (1672), which refers to the heart of an embryo, which seems to leap, and translates L. punctum saliens, going back to Aristotle's writings. Hence, the "starting point" of anything.