n.
Pronunciation: ' ə m-br ə
Function: noun
Inflected Form: plural umbras or um · brae \ -( ˌ )br ē , - ˌ br ī \
Etymology: L
Date: 1638
1 : a shaded area
2 a : 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 b : the central dark part of a sunspot
– um · bral \ -br ə l \ adjective