Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
HEM, n. Sc. usage: one of the fracture planes of quartz-dolerite (see quot.).Sc. 1937 Econ. Geol. Cent. Coalfield I. 104:
The third plane, perpendicular to both ‘reed’ and ‘head’, is called the ‘hem’ and is the second best sphitting plane.