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bas [Irish]

In Ireland, a unit of length, in concept the breadth of the hand, = 1/3 troigid. Also spelled bass.

Kuno Meyer.
Contributions to Irish Lexicography. Vol. I, Part I.
Halle: Max Niemeyer, 1906.

Page 186.

sources

Caiti tomus o grainib ogus uighib?

.i. tri graindi i norlach, ceithri orlaighi i mbais, teora basa i troghid, da troigid dec i fertaig, da fertaigh dec i forraigh, da forraig dec i tir cumaile dia fot, se foirrge dia lethet, ma beith ina toimsib techtaib. Da lan dec uighi circi a meisrim, da meisrim dec i nolldeirb, da oilldeirb dec in noilmedach, no i nolpatraic, da ol feine.

What is the measurement by grains and eggs?

That is, three grains are in an ordlach, four ordlach in a bas, three bas in a troigid, twelve troigid in a fertaig, twelve fertaig in a forrach, twelve forrach in a tir-cumhail, 6 forrach in its breadth, if it be of lawful dimensions.

Twelve times the full of a hen-egg is in a meisrim, twelve mesrim in an ollderbh, twelve ollderbh in an oilmedhach, or in an olpatric, which contains two olfeine.

Commissioners for Publishing the Ancient Laws and Institutes of Ireland.
Ancient Laws of Ireland. Volume III.
Senchus mor (conclusion) being the Corus Bescna, or Customary Law, and the Book of Aicill.
Dublin: Alexander Thom, 1873.
Pages 334-337. From the Book of Aicill.