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.
¶TAMMACHLESS, adj. Having no appetite, esp. of a child that fusses about its food (Fif. 1825 Jam.); also tasteless, insipid (Id.).
[Aphetic form, phs. from children's speech, of Stamack, stomach, + -less.]