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umbra British & World English

The fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse

Umbra in mudminnow British & World English

A small stout-bodied freshwater fish of both Eurasia and North America, able to survive low concentrations of oxygen and very low temperatures

umbra New Oxford Dictionary for Writers & Editors

inner region of a shadow