HyperDic: penumbral

English > 1 sense of the word penumbral:
ADJECTIVEpertpenumbralof or pertaining to the region of partial shadow around an umbra
English > penumbral: 1 sense > adjective 1, pert
MeaningOf or pertaining to the region of partial shadow around an umbra.
Nounspenumbraa fringe region of partial shadow around an umbra

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