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over-vitrified
over-vitrified adj.
Brit. 
/ˌəʊvəˈvɪtrᵻfʌɪd/
, /ˌəʊvəˈvɪtrᵻfʌɪd/U.S. /ˌoʊvərˈvɪtrəˌfaɪd/
/ˌoʊvərˈvɪtrəˌfaɪd/ΚΠ
1783 Philos. Trans. 1782 (Royal Soc.) 72 306 At some times an unvitrified mass, and at others an over-vitrified scoria.
1997 Re: Probl. with Home Dug Clay in Clayart (Electronic mailing list) 27 Aug. Too much spar, and the body is over vitrified and too brittle and it is real tough to fit glazes as well.
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