1510s, "apt or fit to breed," from brood (v.) + -y (2). Figuratively, of persons, "inclined to think long and deeply," from 1851. Also, in modern use (by 1980s), sometimes "full of maternal yearning." Related: Broodily; broodiness.
a broody hen
Bronx
bronze
brooch
brood
brooding
broody
brook
Brooke
Brooklyn
broom
broomstick