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.
BILLER, n. “Water-cress” (Uls. 1880 W. H. Patterson Gl. Ant. and Dwn.).
[Gael. biòlair, water cresses (MacLennan).]