Definition of "umbral" [umbral]

• Of or pertaining to an umbra. (adjective)

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• "For Britain the Moon rises in the NE before it withdraws fully from the central dark umbral shadow at 16:18."
• "  I can see the umbral mass of his fetal-bent body lying beside her as always."
• "By 5: 01 a.m., our lunar neighbor escapes completely from the umbral shadow."