ˈvitro-
combining form on Gr. models of L. vitrum glass, used in a few terms, as vitro-ˈdentine, the hard external layer of dentine in a tooth; ˈvitrophyre, a subdivision of porphyritic rocks; hence vitrophyric adj.; ˈvitrotype (see quot. 1875).
| 1849–52 Todd's Cycl. Anat. IV. 882/1 The dental plate consists..of a central mass of coarse osseous substance..and an external sheath of very hard ‘vitro-dentine’. 1870 tr. Stricker's Man. Histology xv. (N. Syd. Soc.) 471 The central portion [of a tooth] consists of vaso-dentine, which is covered with true dentine; external to which again is a thin layer of vitro-dentine. 1875 Knight Dict. Mech. 2713/2 Vitro-type (Photography), a name given to the processes which involve the production of collodion film pictures on glass. 1882 Geikie Text-Bk. Geol. ii. ii. iii. 90 Vogelsang has proposed to classify this type [Porphyritic] in three divisions: 1st, Granophyre,..2nd, Felsophyre,..3rd, Vitrophyre, where the ground-mass is a glassy magna. 1890 Philos. Mag. March 288 Among the pyroxenic rocks the most noticeable varieties are the labradorite-audesites, the pyroxene-audesites—of which both ‘trachytoid’ and ‘vitrophyric’ forms occur. |