Dictionaries of the Scots Language
Dictionars o the Scots Leid

Scottish National Dictionary (1700–)

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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.

TAM, n. A heap or small mound or hillock, gen. in comb. yirdi(e) tam, yerdy-, a farm compost heap of soil and weeds (Abd. 1972). See Yird.Abd. 1906 J. Christie Drachlaw Revisited 5:
There's the dam Aboon which I spread a “Yirdie Tam.”Abd. 1949 Buchan Observer (8 Nov.):
A top-dressing of farmyard, or compost heap manure, known as “yirditam.”