Merriam-Webster Collegiate Dictionary - farrow

 I. verb  Etymology: Middle English farwen, from Old English *feargian, from Old English fearh young pig; akin to Old High German farah young pig, Latin porcus pig  Date: 13th century  transitive verb to give birth to (a ~)  intransitive verb of swine to bring forth young — often used with down  II. noun  Date: 1577  1. a litter of pigs  2. an act of ~ing  III. adjective  Etymology: Middle English (Scots) ferow  Date: 15th century of a cow not pregnant