Arm

A Concise Dictionary of Middle English from A.D. 1150 to 1580 · 1889 · p. 4

sb. arm, MD; earmes , pl. , S, MD; armes , interj. arms! an oath, by God’s arms, S3, NED. Phr. : Gog’s arms , S3.—AS. earm : Icel. armr : Goth. arms .