/ Dictionary / Index B B.S.L.Arch.: Meaning and Definition of Find definitions for: B.S.L.Arch. Pronunciation: [key] Bachelor of Science in Landscape Architecture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. B.S.Lab.Rel. B.S.L.M. Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language