"ascending," especially "ascending a river to spawn" (as salmon and other fishes do), 1753, from Latinized form of Greek anadromos "running upward," from ana "up, upward" (see ana-) + dromos "a running," from dramein "to run" (see dromedary).
before vowels an-, word-forming element meaning: 1. "upward, up in place or time," 2. "back, backward, against," 3. "again, anew," from Greek ana (prep.) "up, on, upon; up to, toward; throughout; back, backwards; again, anew," from an extended form of PIE root *an- (1) "on, upon, above" (see on, which is the English cognate). In old medical prescriptions, ana by itself meant "an equal quantity of each."
"thoroughbred Arabian camel," late 13c., from Old French dromedaire and directly from Late Latin dromedarius "kind of camel," from Latin dromas (genitive dromados), from Greek dromas kamelos "running camel," from dromos "a race course," from dramein "to run," from PIE *drem- "to run" (source also of Sanskrit dramati "runs, goes," perhaps also Old English trem "footstep").
A variety of the one-humped Arabian camel bred and trained for use as a saddle-animal, "and comparing with the heavier and slower varieties as a race-horse does with a cart-horse; it is not a different animal zoologically speaking" [Century Dictionary]. An early variant in English was drumbledairy (1560s).
<a href="https://www.etymonline.com/word/anadromous">Etymology of anadromous by etymonline</a>
Harper, D. (n.d.). Etymology of anadromous. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/anadromous