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gangrene (n.)

"putrefaction or necrosis of soft tissues," 1540s, cancrena, from Latin gangraena (Medieval Latin cancrena), from medical Greek gangraina "an eating or gnawing sore," literally "that which eats away," a dissimilated, reduplicated form of gran- "to gnaw," from PIE root *gras- "to devour" (see gastric).

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gangrenous (adj.)
1610s, from gangrene + -ous. Perhaps modeled on French gangréneux.
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bed-sore (n.)
"gangrene caused by anemia due to continued pressure," 1833, from bed (n.) + sore (n.). A kind of ulcer liable to afflict persons long confined in bed and unable to change position.
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herpes (n.)
late 14c., "any inflammatory, spreading skin condition" (used of shingles, gangrene, etc.), from Latin herpes "a spreading skin eruption," from Greek herpes, the name for the disease shingles, literally "creeping," from herpein "to creep, move slowly" (cognate with Latin serpere "to creep;" see serpent). The condition was not distinguished into specific diseases until early 19c.
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