LSJ
ἡ, (< νέκυς) a magical rite by which ghosts were called up and questioned about the future, Plu. 2.17b (pl.); νεκυίᾳ χρήσασθαι Hdn. 4.12.4; name for the eleventh Book of the Odyssey, D.S. 4.39, Plu. 2.740e.
funeral ceremony, τῶν ἀμφὶ τὴν ν. τε καὶ τὰς διαθήκας καλινδουμένων Luc. Nigr. 30.
rabble, used contemptuously of Caesar΄s entourage, Cic. Att. 9.18.2, cf. Attic. ap. eund. Att. 9.10.7.
= φλόμος, so called because used in necromancy, Cyran. 30 (written νεκύα).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)