The word was the common one for "cancer" until c. 1700, but since the reintroduction of cancer in a more scientific sense it has tended to be restricted to gangrenous sores of the mouth. Also used since 15c. of caterpillars and insect larvae that eat plant buds and leaves. As a verb, "to corrode, corrupt," from late 14c. Related: Cankered; cankerous.
1798, "common hemp," from Cannabis, Modern Latin plant genus named (1728), from Greek kannabis "hemp," a Scythian or Thracian word. Also source of Armenian kanap', Albanian kanep, Russian konoplja, Persian kanab, Lithuanian kanapės "hemp," and English canvas and possibly hemp. In reference to use of the plant parts as an intoxicant, from 1848. Related: Cannabic.
1854, "put up in a can," past-participle adjective from can (v.2). In reference to music, "pre-recorded," from 1903 (with an isolated, hypothetical use from 1894).
John Phillip Sousa, the celebrated bandmaster, strongly condemns "canned music," by which he means automatic musical instruments, such as pianos, organs, graphophones, etc. The professor foresees in the distant future none but mechanical singers, mechanical piano-players, mechanical orchestras, etc., factories running night and day turning out automatic music; bandmasters, choir leaders, organists, etc., being compelled to labor otherwise for their living. [The Cambrian, September 1906]
The natives were believed by the Europeans to be anthropophagites. Columbus, seeking evidence that he was in Asia, thought the name meant the natives were subjects of the Great Khan. The form was reinforced by later writers who connected it to Latin canis "dog," in reference to their supposed voracity, a coincidence which "naturally tickled the etymological fancy of the 16th c." [OED]. The Spanish word had reached French by 1515. Used of animals from 1796. An Old English word for "cannibal" was selfæta.