אַמָּה ʼammâh (H521)

{properly, a mother (i.e. unit of measure, or the fore-arm (below the elbow), i.e. a cubit; also a door-base (as a bond of the entrance)}

1) cubit-a measure of distance (the forearm), roughly 18 in (. 5 m)

(Aramaic) corresponding to אַמָּה (H520)