umbra
/ˈʌmbrə/noun
(pl. umbras 或umbrae /-briː/)
1- 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暗影; 本影。比较PENUMBRA.
1.1
- Astronomy the dark central part of a sunspot【天文】太阳黑子中心。
1.2
- mass noun chiefly poetic/literary shadow or darkness〈主诗/文〉荫, 阴影。
派生词
umbral
adjective词源
late 16th cent. (denoting a phantom or ghost)： from Latin, literally 'shade'.