Pronunciation: (hi-lī'u-kul), [key]
adj. Astron.
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.

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