UMBRA
- shade; shadow.
- a conical shadow excluding all light from a given source specifically the conical part of the shadow of a celestial body excluding all light from the primary source.
- The fully shaded inner region of a shadow cast by an opaque object, esp. the area on the earth or moon experiencing the total phase of an eclipse
- The dark central part of a sunspot
- Shadow or darkness
- a dark area [n UMBRAE, UMBRAS] : UMBRAL [adj]