/ Dictionary / Index L Lacus Solis: Meaning and Definition of Find definitions for: Lac'us So'lis Pronunciation: (lak'us sō'lis), [key] an area in the southern hemisphere of Mars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lacunule lacustrine Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language