Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BILL-AIX, n. “A light hatchet for chopping twigs and branches” (w.Sc. 1887 Jam.6); bullax, [q.v.] Bnff.; balax, Abd. (Jam.6).