the young birds hatched at one time; a hatch; as, a brood of chickens.-the young from the same dam, whether produced at the same time or not; young children of the same mother, especially if nearly of the same age; offspring; progeny; as, a woman with a brood of children.-that which is bred or produced; breed; species.-heavy waste in tin and copper ores.-sitting or inclined to sit on eggs.-kept for breeding from; as, a brood mare; brood stock; having young; as, a brood sow.-to sit on and cover eggs, as a fowl, for the purpose of warming them and hatching the young; or to sit over and cover young, as a hen her chickens, in order to warm and protect them; hence, to sit quietly, as if brooding.-to have the mind dwell continuously or moodily on a subject; to think long and anxiously; to be in a state of gloomy, serious thought; -- usually followed by over or on; as, to brood over misfortunes.-to sit over, cover, and cherish; as, a hen broods her chickens.-to cherish with care.-to think anxiously or moodily upon.