A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 1951 (DOST Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
Foster-sister, n. [e.m.E. (1649).] —1588 Treas. Acc. MS. 107 b.
To … his hienes foster sister for bying hir certane habillementis