Pronunciation: (hi-lī'u-kul), [key]
pertaining to or occurring near the sun, esp. applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible. Also,he•li•acPronunciation: (hē'lē-ak"). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.