/ Dictionary / Index H hectocotylus: Meaning and Definition of Find definitions for: hec•to•cot•y•lus Pronunciation: (hek"tu-kot'l-us), [key] — pl. -cot•y•li a modified arm of the male of certain cephalopods that is used to transfer sperm to the female. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hecto- hectogram Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language