The Collaborative International Dictionary
Glacious
Glacious \Gla"cious\, a.
Pertaining to, consisting of or resembling, ice; icy.
--Sir
T. Browne.
Wiktionary
glacious
a. characteristic, composed, or of the nature of icy; icy.“Gla"cious” listed in '''Webster’s Revised Unabridged Dictionary''' (1996, 1998)