umbra
/ˈʌmbɹə/ noun
Forms umbras umbrae umbræ
- noun The fully shaded inner region of a shadow cast by an opaque object.
- noun (astronomy) The area on the earth or moon experiencing the total phase of an eclipse.
- noun (astronomy) The central region of a sunspot.
- noun (chiefly literary) A shadow.
- noun (archaic) An uninvited guest brought along by one who was invited.
- noun One of the family Umbridae of mudminnows.
- noun One of genus Umbrina of drums (family Sciaenidae).
- noun (mathematics) An element of the umbral calculus.
Etymology
Borrowed from Latin umbra (“shadow”). Doublet of umber.
Webster’s 1913
- noun (a) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; --used in contradistinction from penumbra. See Penumbra.
- noun Any one of several species of sciænoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa), which is highly esteemed as a market fish; --called also ombre, and umbrine.
Etymology [L., a shadow.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “umbra”, CC BY-SA 4.0. Details