Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
EXTRIE, n. An axle. See also Aix-tree, id. Also †extre (Sc. 1710 T. Ruddiman Gl. to Douglas Aeneis), extree (Sc. 1845 T. Brown Sc. Dict.).Abd. 1920 A. Robb MS.:
The extries an' wheels wis made o' timmer. . . . This point cam throu the wheel aboot sax inches an' the raceplate gaed in throu a hole in the point of the extrie.