GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Muggy , a. [Compar. Muggier ; superl. Muggiest.] [Cf. Icel. mugga mist, mugginess. Cf. 4th Mold.]
   Moist; damp; moldy; as, muggy straw.
   1913 Webster
   Warm, damp, and windless; uncomfortably hot and humid; sultry; as, muggy air, weather.
   1913 Webster