[hyoo-mid or, often, yoo-]
containing a high amount of water or water vapor; noticeably moist: humid air; a humid climate.

1375–1425; late Middle English < Latin (h)ūmidus, equivalent to (h)ūm(ēre) to be moist + -idus -id4

humidly, adverb
humidness, noun
subhumid, adjective
unhumid, adjective

dank, wet. See damp. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
humid (ˈhjuːmɪd)
moist; damp: a humid day
[C16: from Latin ūmidus, from ūmēre to be wet; see humectant, humour]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1412 (implied in humidity), from O.Fr. humide, from L. humidus "moist, wet," var. (by infl. of humus "earth") of umidus, from umere "be moist."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The beads form faster if the weather is humid or if the pie is chilled.
Avoid exercise or strenuous physical activity outside during hot or humid
Cold-weather noses may function differently from those that evolved in hot and
  humid climates.
Often a hurricane leaves behind stiflingly hot, humid weather that puts tempers
  on edge.
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