late 14c., "part for whole or vice versa," from Medieval Latin synodoche, from Late Latin synecdoche, from Greek synekdokhe, literally "a receiving together or jointly," from synekdekhesthai "supply a thought or word, take with something else," from syn- "with" (see syn-) + ek "out" (see ex-) + dekhesthai "to receive," related to dokein "seem good" (see decent). Figure in which an attribute or adjunct is substituted for the thing meant ("head" for "cattle," etc.).