Medical Dictionary
penumbra
noun pe·num·bra \pə-ˈnəm-brə\
plural pe·num·brae \-(ˌ)brē, -ˌbrī\ or pe·num·bras
Medical Definition of PENUMBRA
: a blurred area in a radiograph at the edge of an anatomical structure
—pe·num·bral \-brəl\ adjective
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