umbra

名词 n.
中文释义
发音 ŭmʹbrə

英文释义

名词 n.
  1. The fully shaded inner region of a shadow cast by an opaque object.
  2. The fully shaded inner region of a shadow cast by an opaque object.; The area on the earth or moon experiencing the total phase of an eclipse.
  3. The central region of a sunspot.
  4. A shadow. literary
  5. An uninvited guest brought along by one who was invited. archaic
  6. One of the family Umbridae of mudminnows.
  7. One of genus Umbrina of drums (family Sciaenidae).
  8. An element of the umbral calculus.
    — In order to set up such an algorithm, we need the notion of multiplicative inverse of an umbra. Two umbrae are said to be multiplicative inverse to each other when αγ ≡ u.

词形变化

umbras plural umbrae plural umbræ obsolete,plural

词汇关系

衍生词
adumbrate antumbra Bernoulli umbra penumbra umbral umbra recta umbra versa umbrella
并列词
antumbra penumbra

词源

Borrowed from Latin umbra (“shadow”). Doublet of umber.
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