a. Obs. rare–1. [irreg. f. FRIGID + -(I)OUS.] Frigid, intensely cold.

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1630.  J. Taylor (Water P.), Anagrams & Sonn., Wks. II. 257/1.

        Frigidious Ianus two-fold frozen face,
Turnes moyst Aquarius into congeal’d yce.

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