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The Collaborative International Dictionary
Conglaciation

Conglaciation \Con*gla`ci*a"tion\, n. [Cf. F. conglaciation.] The act or process of changing into ice, or the state of being converted to ice; a freezing; congelation; also, a frost.
--Bacon.

Wiktionary
conglaciation

n. (context archaic English) The act or process of changing into ice; a freeze or congelation.