m. (false spelling arngeirr), a bill or halberd, undoubtedly a foreign weapon, rarely mentioned in the Sagas, but famous as the favourite weapon of Gunnar of Hlíðarendi; mentioned besides in Sks. 392, Landn. 163, Eb. 120, Fms. iii. 100, v. 249, Fas. iii. 462, but esp. Nj. 44, 45, 84, 95, 97, 108, 114, 119: in the Nj. used generally of thrusting, but also of hewing; Högni hjó í sundr spiót skaptið með atgeirinum, en rekr atgeirinn i gegnum hann, H. hewed in sunder the spearshaft with the bill, and drives the bill through him, Nj. 119; in Landn. 163 mentioned as a javelin.