infectious

Part of speech: noun

Infectiousness.

Part of speech: adverb

INFECTIOUSLY.

Part of speech: adjective

Liable to infect; contagious.

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Usage examples "infectious":

  1. When she took infectious cases and dared neither write nor speak to him, they had an hour planned beforehand when she would smile at him from an open window and wave her hand. - "Love, The Fiddler", Lloyd Osbourne.
  2. Mr. Arnold looked at first as if he did not know what she was talking about; then he began to laugh, and his laugh was so infectious that Miss Falkner could not help joining him. - "Jill's Red Bag", Amy Le Feuvre.
  3. Nothing infectious, I believe, but they didn't seem to consider him a desirable citizen. - "Masters of the Wheat-Lands", Harold Bindloss.