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Adjective: penumbral  pi'núm-brul
  1. Of or pertaining to the region of partial shadow around an umbra

Encyclopedia: Penumbral

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pentoxifylline
Pentstemon
pent-up
pentylenetetrazol
penuche
penuchle
penult
penultima
penultimate
penumbra
penumbral
penurious
penuriously
penuriousness
penury
Penutian
Penzance
peon
peonage
peony
peony family