/ Dictionary / Index B beam sea: Meaning and Definition of Find definitions for: beam' sea' Pronunciation: [key] — Naut. Naut. a sea striking the vessel at right angles to its keel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beam reach beam splitter Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language