Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
†GAD, n.1 Applied to ice: a large mass (Dmf. 1825 Jam.).
[Of uncertain origin. ? A specialised use of Gaud, n.2 Cf. also Mod.Icel. gaddr, gadd, hard-trampled snow. ]