stirk UK /stɜːk/US /stɝk/ noun1 •(dialect, old-fashioned) A yearling cow; a young bullock or heifer.But beware of MacPhadraick, my son; for when he called himself the friend of your father, he better loved the most worthless stirk in his herd, than he did the life-blood of MacTavish Mhor. — 1827 formsstirks