Noun
A young hen, or female of the domestic fowl.
Source: Webster's dictionaryFemales over a year old are known as hens and younger females as pullets citation although in the egg-laying industry, a pullet becomes a hen when she begins to lay eggs at 16 to 20 weeks of age. Source: Internet
The word "pullet" itself comes from Middle English pulet, from Old French polet, both from Latin pullus, a young fowl, young animal or chicken. citation citation The word "fowl" is of Germanic origin (cf. Source: Internet