American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
The tightening of the muscles around his mouth is barely perceptible, the widening of the eyes infinitesimal, but all the more powerful for it.— Expecting Rain
This is what we all admit in practice; the smallest of our acts implies the belief in something perceptible which is wider and more durable than our astonished perceptions.— The Mind and the Brain Being the Authorised Translation of L'Âme et le Corps
The breathing was scarcely perceptible, and the beating of the heart was faint A strange case," said Lefevre in a low voice to his young comrade--"the strangest I've seen.— Master of His Fate
[34 Although the distinctively individual odor of most persons is not sufficiently marked to be generally perceptible, there are cases in which it is more distinct to all nostrils.— Studies in the Psychology of Sex, Volume 4 Sexual Selection In Man

American Heritage Dictionary (1)
Century Dictionary (1)
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