type of bulbous flowering plant, 1540s, from Latin narcissus, from Greek narkissos, a plant name, not the modern narcissus, possibly a type of iris or lily, associated with Greek narkē "numbness" (see narcotic (n.)) because of the sedative effect of the alkaloids in the plant, but Beekes considers this folk-etymology and writes that "The suffix clearly points to a Pre-Greek word."

word-forming element meaning "stupor, narcosis, sleep," also "of or pertaining to narcotic drugs," from Latinized form of Greek narko-, combining form of narke "numbness" (see narcotic (n.)).

"condition characterized by a tendency to fall into a short sleep on any occasion," 1880, from French narcolepsie, coined 1880 by French physician Jean-Baptiste-Édouard Gélineau (1859-1928) from Latinized combining form of Greek narkē "numbness, stupor" (see narcotic (n.)) + -lepsie (as in epilepsy), from Greek lepsis "an attack, seizure," from leps-, future stem of lambanein "take, take hold of, grasp" (see lemma). Related: Narcoleptic; narcolept.

1690s, "state of unconsciousness caused by a narcotic," Modern Latin, from Greek narkōsis, from narkoun "to benumb" (see narcotic (n.)).