/ Dictionary / Index L line of apsides: Meaning and Definition of Find definitions for: line' of ap'sides Pronunciation: [key] — Astron. Astron. the major axis of an elliptical orbit. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. linen paper line of battle Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language