late 15c., predacioun, "act of plundering or pillaging," from Latin praedationem (nominative praedatio) "a plundering, act of taking booty," from praedari "to rob, to plunder," from praeda "plunder, booty, prey" (see prey (n.)). Zoological sense recorded from 1907.
compound adjectival word-forming element of Latin origin, attached to verb stems and expressing intensity of action: "given to, inclined to, abounding in," or expressing intensity of physical or mental action, from Latin -aci- (nominative -ax, accusative -acem), noun ending used with verbal stems (see -acea), + -ous. The accompanying nouns are formed in -acity.
<a href="https://www.etymonline.com/word/predacious">Etymology of predacious by etymonline</a>
Harper, D. (n.d.). Etymology of predacious. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/predacious