/ Dictionary / Index A Ancaeus: Meaning and Definition of Find definitions for: An•cae•us Pronunciation: (an-sē'us), [key] — n. Class. Myth. a son of Poseidon who joined the Argonauts and became helmsman of the Argo. a descendant of Lycurgus who, among the Argonauts, was second in strength only to Hercules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ANC Ancaster Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language