/ Dictionary / Index H helicoid: Meaning and Definition of Find definitions for: hel•i•coid Pronunciation: (hel'i-koid", hē'li-), [key] — adj. coiled or curving like a spiral. —n. a warped surface generated by a straight line moving so as to cut or touch a fixed helix. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. helicograph helicon Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language