Penumbra apex Synonyms

Definitions for Penumbra


  • (noun) partial darkness due to the obstruction of light rays
  • (noun) something that covers or conceals like a piece of cloth
  • (noun) a fringe region of partial shadow around an umbra

Synonyms for phrase

PA abbreviation

PA is an abbreviation for Penumbra Apex
What does PA stand for?
PA stands for "Penumbra Apex"

Definitions for Apex


  • (noun) the highest part or point
  • (noun) the last and usually sharp or tapering part of something long and narrow
  • (noun) the highest point (of something)