Defn: Heavy waste in tin and copper ores. To sit on brood, to ponder.
[Poetic] Shak.

BROOD
Brood, a.

1. Sitting or inclined to sit on eggs.

2. Kept for breeding from; as, a brood mare; brood stock; having young; as, a brood sow.

BROOD
Brood, v. i. [imp. & p. p. Brooded; p. pr. & vb. n. Brooding.]

1. 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. Birds of calm sir brooding on the charmed wave. Milton.

2. 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. Brooding on unprofitable gold. Dryden. Brooding over all these matters, the mother felt like one who has evoked a spirit. Hawthorne. When with downcast eyes we muse and brood. Tennyson.

BROOD
Brood, v. t.

1. To sit over, cover, and cherish; as, a hen broods her chickens.

2. To cherish with care. [R.]