Strong's #679: 'atstsiyl (pronounced ats-tseel')

from 680 (in its primary sense of uniting); a joint of the hand (i.e. knuckle); also (according to some) a party-wall (Ezek. 41:8):--(arm) hole, great.

Brown-Driver-Briggs Hebrew Lexicon:

ּ

'atstsı̂yl

1) joining, joint (such as elbow etc)

Part of Speech: noun feminine

Relation: from H680 (in its primary sense of uniting)

Usage:

This word is used 3 times:

 

Jeremiah 38:12: "cast clouts and rotten rags under thine armholes under the cords."
Ezekiel 13:18: "pillows to all armholes, kerchiefs upon"
Ezekiel 41:8: "of the side chambers were a full reed of six great cubits."