Day 2: Umbra

The Word of the Day is

umbra

noun

1. shade; shadow.

2. the invariable or characteristic accompaniment or companion of a person or thing.

3. Astronomy.

   1. the complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off.
   2. the dark central portion of a sunspot.

4. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image