Maunder Minimum Definition

môndər, män-

noun

A period of unusually low sunspot activity lasting from approximately 1645 to 1715, corresponding roughly to the middle and coldest portion of the Little Ice Age.

American Heritage

pronoun

(astronomy) The period between 1645 and 1715 marked by records and other indications of very low levels of sunspot activity of Earth's sun, corresponding to a period of global cooling.

Wiktionary

Origin of Maunder Minimum

After Edward Walter Maunder (1851–1928), British astronomer who identified it in records of sunspot activity from the time

From American Heritage Dictionary of the English Language, 5th Edition