follow Dictionary.com

What is the X in X-mas?

active sun

noun, Astronomy
1.
the sun at a maximum of solar activity, occurring every 11 years.
2.
solar activity, superimposed on an unchanging background.
Origin
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source

Word of the Day

Difficulty index for active sun

Few English speakers likely know this word

Word Value for active

11
13
Scrabble Words With Friends

Quotes with active-sun