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friable (adj.)

"easily crumbled or pulverized; easily reduced to powder," 1560s, from French friable (16c.) and directly from Latin friabilis "easily crumbled or broken," from friare "rub away, crumble into small pieces," related to fricare "to rub" (see friction). Related: Friability. "Confusion between the common word meaning crumbly & the -able adjective from fry is not likely enough to justify the irregular spelling fryable for the latter ...." [Fowler].

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Definitions of friable from WordNet

friable (adj.)
easily broken into small fragments or reduced to powder;
friable sandstone
friable carcinomatous tissue
friable curds formed in the stomach
Synonyms: crumbly
From wordnet.princeton.edu