- penumbraA partially shaded area around the edges of a shadow, especially an eclipse.
- penannularForming an almost complete ring, but with a break or opening.
- pene-Almost the thing or quality expressed by the root, as peneplain (almost a plain), peninsula (almost an island), penultimate (almost the last), penumbra (almost in shadow).
- peninitialFalling in the position after initial position; second.