ground·mass 
(groundmăs′)
(groundmăs′)n.
The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded.
| 单词 | groundmass |
| 释义 | ground·mass (groundmăs′)n. The fine-grained crystalline base of porphyritic rock in which larger crystals are embedded. |
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