groundmass
noun
ground·mass ˈgrau̇n(d)-ˌmas 
: the fine-grained or glassy base of a porphyry in which the larger distinct crystals are embedded
Word History
First Known Use
1879, in the meaning defined above
- cardings
- cardio
- cardio-
- cardioaccelerations
- cardioaccelerators
- cardioblast
- cardiocarpon
- cardiocarpum
- cardiogenic
- cardiogram
- cardiograms
- cardiograph
- cardiographers
- cardiographic
- cardiographies
- cardiographs
- cardiography
- cardioid
- cardioid condenser
- cardioid microphone
- cardioids
- cardiologic
- cardiological
- cardiologies
- cardiologist