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New American Oxford Dictionary

rudaceous

ru da ceous |ˈro͝oˈdāSHəs ˈrudeɪʃəs | ▶adjective Geology (of rock ) composed of relatively large fragments (larger than sand grains ). ORIGIN early 20th cent.: from Latin rudus ‘rubble ’ + -aceous .

 

Oxford Dictionary

rudaceous

rudaceous |rʊˈdeɪʃəs | ▶adjective Geology (of rock ) composed of fragments of relatively large size (larger than sand grains ). ORIGIN early 20th cent.: from Latin rudus ‘rubble ’ + -aceous .