Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BOOLER, n.1 “A large marble for throwing” (Bnff.2 1935).
[From Bool, n.1 + -er, suff. indicating something large of its kind. Cf. thumper, bounder, etc.]
