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penumbraOne entry found. Main Entry: pen·um·bra Pronunciation: \pə-ˈnəm-brə\ Function: noun Inflected Form(s): plural pen·um·brae \-(ˌ)brē, -ˌbrī\ or pen·um·bras Etymology: New Latin, from Latin paene almost + umbra shadow — more at umbrage Date: 1666 1 a : a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light b : a shaded region surrounding the dark central portion of a sunspot — pen·um·bral \-brəl\ adjective
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