Definition of umbras:
(n) :
The fully shaded inner region of a shadow cast by an opaque object.
(n) :
(astronomy) The area on the earth or moon experiencing the total phase of an eclipse.
(n) :
(chiefly literary) A shadow.
(n) :
(astronomy) The central region of a sunspot.
(n) :
One of the family Umbridae of mudminnows.
(n) :
One of genus Umbrina of drums (family Sciaenidae).