FRUIT [C, U] › a small, green fruit that is sour like a lemon TREE [C] (also lime tree) › a large tree that has pale green leaves and yellow flowers SUBSTANCE [U] › a white substance that is found in water and soil and is used to improve the quality of soil COLOUR [U] (also lime green) › a bright colour that is a mixture of yellow and green lime (also lime-green) adjective