Undercoat :: Undercoat (n.) A coat worn under another; a light coat, as distinguished from an overcoat, or a greatcoat..
Undercoat :: Undercoat (n.) A growth of short hair or fur partially concealed by a longer growth; as, a dog's undercoat..
Underconsumption :: Underconsumption (n.) Consumption of less than is produced; consumption of less than the usual amount.