O

n. pl. Oats. (Bot.) A well-known cereal grass and its edible grain; - commonly used in the plural and in a collective sense. A musical pipe made of oat straw.

 - Animated oats or Animal oats (Bot.), A grass (Avena sterilis) much like oats, but with a long spirally twisted awn which coils and uncoils with changes of moisture, and thus gives the grains an apparently automatic motion.

 - Oat fowl (Zool.), the snow bunting; - so called from its feeding on oats.

 - Oat grass (Bot.), the name of several grasses more or less resembling oats, ...