= ice age, n. 1. Now historical and rare.

the geological epoch in which boulder-formations were being produced, the Ice Age or Glacial Period.

Geology. Characterized by the presence of ice. glacial epoch, glacial era, glacial period, a geological period during which it is supposed that the…

Geology and Climatology. A period when large areas of the earth were covered with ice; a glacial episode (cf. glacial, adj. 3), esp. any of those…

Geology. A glacial or interglacial period.

a relatively short or moderate period of colder climate and increased glaciation occurring between warmer periods; spec. (usually the Little Ice Age)…