a. 1. worried and thinking long and intensely, especially about a particular problem. Syn. -- broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative, gloomy, morose. [ WordNet 1.5 ]
a. good at incubating eggs, especially of a fowl kept for that purpose; as, a brooding hen. Syn. -- brood, hatching. [ WordNet 1.5 ]
n. the process of sitting on eggs so as to hatch them by the warmth of the body; -- mostly used of birds. Syn. -- incubation. [ WordNet 1.5 ]