penumbra is a topic covered in the Taber's Medical Dictionary.

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(pĕ-nŭm′bră )

[L. paene, almost + L. umbra, shadow, shade]

1. Healthy tissue that surrounds an ischemic or infarcted part.
2. A shadow, e.g., around a radiographic image or at the margin of tissue treated with radiation therapy.

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Citation

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TY - ELEC T1 - penumbra ID - 736754 Y1 - 2017 PB - Taber's Medical Dictionary UR - https://www.tabers.com/tabersonline/view/Tabers-Dictionary/736754/all/penumbra ER -