Ŏn'o-măs'ti-con, n.

n. [Gr. ὀνομαστικόν (sc. βιβλίον), from ὀνομαστικός, belonging to naming, from ὀνομάζειν, to name, from ὄνομα, name.] A collection of names and terms; an arrangement of topics with their names; a dictionary; a common-place book.