porphyraceousadj.
/ˌpɔːfᵻˈreɪʃəs/, U.S. /ˌpɔrfəˈreɪʃəs/ Geology. rare.
= porphyritic adj.
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the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > porphyry
porphyritic1791
porphyroid1798
porphyraceous1799
porphyric1824
phyric1958
1799 R. Kirwan Geol. Ess. 207 Charpentier mentions a sort of stone which he calls porphyraceous, though he does not ascribe felspar to it.
1998 Lithos 45 462/1 Hypabyssal emplacement of the granitoid bodies is evidenced by the following field data... (3) Intrusive rocks are porphyraceous and often fine-grained.
This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).
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adj.1799