early 15c., cors "ordinary" (modern spelling is from late 16c.), probably adjectival use of noun cours (see course (n.)). Originally referring to rough cloth for ordinary wear, the sense of "rude, vulgar, unpolished" developed by c. 1500 and that of "obscene" by 1711.
Perhaps via the notion of "in regular or natural order," hence "common, vulgar" (compare the development of mean (adj.), also ornery from ordinary). Or it might be via the clothing sense, and the notion of "wanting fineness of texture or elegance of form." Or both, and there might be also an influence, via metathesis, of French gros (see gross (adj.)), which underwent a similar sense development. Related: Coarsely; coarseness.
word-forming element meaning "long, abnormally large, on a large scale," taken into English via French and Medieval Latin from Greek makros "long, large," from PIE root *mak- "long, thin."
"commanding naval officer," 1690s, probably via Dutch kommandeur from French commandeur, from Old French comandeor (see commander). The U.S. Navy rank was created 1862, above a captain, below a rear-admiral.
"ascription of false authorship to a book," 1842, probably via German or French, from Modern Latin pseudepigrapha (see pseudepigrapha). Related: Pseudepigraphic (1830); pseudepigraphical (1838); pseudepigraphal (1630s).