pullet (n.)

late 14c., "young fowl" (late 13c. as a surname), from Anglo-French pullet, Old French poulette, poilette, diminutive of poule, poille "hen," from Vulgar Latin *pulla, fem. of Latin pullus "young animal," especially "young fowl" (source also of Spanish pollo "chicken," Italian pollo "fowl," from PIE root *pau- (1) "few, little" (compare pony). Technically, a young hen from the time she begins to lay until the first molt.