Marine acid (Chem.), hydrochloric acid. [Obs.] -- Marine barometer. See under Barometer. -- Marine corps, a corps formed of the officers, noncommissioned officers, privates, and musicants of marines. -- Marine engine (Mech.), a steam engine for propelling a vessel. -- Marine glue. See under Glue. -- Marine insurance, insurance against the perils of the sea, including also risks of fire, piracy, and barratry. -- Marine interest, interest at any rate agreed on for money lent upon respondentia and bottomry bonds. -- Marine law. See under Law. -- Marine league, three geographical miles. - - Marine metal, an alloy of lead, antimony, and mercury, made for sheathing ships. Mc Elrath. -- Marine soap, cocoanut oil soap; -- so called because, being quite soluble in salt water, it is much used on shipboard. -- Marine store, a store where old canvas, ropes, etc., are bought and sold; a junk shop. [Eng.]

Tell that to the marines, an expression of disbelief, the marines being regarded by sailors as credulous. [Colloq.]