umbra
/ˈʌmbɹə/
Word Rarity
Very rare
Frequency: Zipf frequency 2.39 in modern English
9
Scrabble Score
5
Letters
2
Syllables
5
Unique Chars
Meaning
noun
The central region of a sunspot.
noun
One of the family Umbridae of mudminnows.
noun
An element of the umbral calculus.
Example Sentences
- "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."
Etymology
Origin
- Source language: Latin
Word Breakdown
- Root: umbra