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.
AGGISOM, adj. (See quot.) (Only Sh.)Sh. 1908 Jak. (1928):
Agisom, frightful; fear-inspiring.Sh. 1914 Angus Gl.:
Aggisom, having a threatening appearance.