American Dictionary of the English Language

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HIA'TUS, noun [Latin from hio, to open or gape.]

1. An opening; an aperture; a gap; a chasm.

2. The opening of the mouth in reading or speaking, when a word ends with a vowel, and the following word begins with a vowel.

3. A defect; a chasm in a manuscript, where some part is lost or effaced.