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The Collaborative International Dictionary
Epidemical

Epidemic \Ep`i*dem"ic\, Epidemical \Ep`i*dem"ic*al\, a. [L. epidemus, Gr. ?, ?, among the people, epidemic; ? in + ? people: cf. F. ['e]pid['e]mique. Cf. Demagogue.]

  1. (Med.) Common to, or affecting at the same time, a large number in a community; -- applied to a disease which, spreading widely, attacks many persons at the same time; as, an epidemic disease; an epidemic catarrh, fever, etc. See Endemic.

  2. Spreading widely, or generally prevailing; affecting great numbers, as an epidemic does; as, epidemic rage; an epidemic evil.

    It was the epidemical sin of the nation.
    --Bp. Burnet.

Wiktionary
epidemical

a. (alternative form of epidemic English)

Usage examples of "epidemical".

But, in the Isle of Cephalonia, his projects were fatally blasted by an epidemical disease: Robert himself, in the seventieth year of his age, expired in his tent.

During the winter that preceded the Turkish conquest, the nation was distracted by this epidemical frenzy.

By the stagnation of these waters an epidemical disease of the most fatal nature was occasioned.

Of all things, wisdom is the most terrified with epidemical fanaticism, because of all enemies it is that against which she is the least able to furnish any kind of resource.