World English Dictionary
rudaceous (ruːˈdeɪʃəs)
arenaceous Compare argillaceous (of conglomerate, breccia, and similar rocks) composed of coarse-grained material
[C20: from Latin rudis coarse, rough + -aceous]

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Main Entry:  rudaceous
Part of Speech:  adj
Definition:  pertaining to coarse-grained (grain size 2mm or more) sedimentary rock
Usage:  science's 21st Century Lexicon
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