also accessary, early 15c., "that which is subordinate to something else," also as a legal term, "one aiding in a felony without committing the offense" (as by advising, inciting, concealing), from Late Latin accessorius, from Latin accessor, agent noun of accedere "to approach" (see accede).
Strictly the noun (a person) should be accessary, the adj. (and noun, a thing) accessory; but the distinction is too fine to be maintained. [Century Dictionary]
Especially in the visual arts, "object introduced to balance composition or enhance artistic effect" (1540s). Attested from 1896 as "woman's smaller articles of dress;" hence accessorize. Related: Accessorial.
"pertaining to the head," early 15c., from Latin cephalicus, from Greek kephalikos "pertaining to the head," from kephalē "head" (see cephalo-).
word-forming element meaning "having a head" (of a specified type), from Greek kephalē "head" (see cephalo-).
word-forming element in medicine meaning "a vein or veins," from Greek phlebo-, combining form of phleps "vein," a word of uncertain origin.