• MOOSE (noun). The noun MOOSE has 1 sense: 1. large northern deer with enormous flattened antlers in the male; called 'elk' in Europe and 'moose' in North America. Familiarity information: MOOSE used as a noun is very rare. MOOSE (noun). The noun MOOSE has 1 sense: 1. large northern deer with enormous flattened antlers in the male; called 'elk' in Europe and 'moose' in North America. Familiarity information: MOOSE used as a noun is very rare.