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The penumbra is the part of a shadow where the light source is only partially blocked. Penumbra may also refer to: ==Science== * Penumbra (Sun), the ring-shaped semi-bright region of a sunspot that surrounds the darker umbra * Penumbra (medicine), surviving tissue at the margin of an ischemic event (such as a stroke) which is in danger of hypoxia and subsequent cell death * ''Billbergia'' 'Penumbra', a hybrid cultivar of the genus ''Billbergia'' in the Bromeliad family * Penumbral lunar eclipse, an eclipse that occurs when the Moon passes through the Earth’s penumbra 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Penumbra (disambiguation)」の詳細全文を読む スポンサード リンク
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