/ Dictionary / Index A aclinic line: Meaning and Definition of Find definitions for: a•clin'ic line' Pronunciation: (ā-klin'ik), [key] an imaginary line on the surface of the earth, close and approximately parallel to the equator, connecting all those points over which a magnetic needle shows no inclination from the horizontal. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acleistocardia A.C.L.S. Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language