hiatu

n.; pl. L. Hiatus, E. Hiatuses [ L., fr. hiare, hiatum, to gape; akin to E. yawn. See Yawn. ] 1. An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a space where something is wanting; a break. [ 1913 Webster ]

2. (Gram.) The concurrence of two vowels in two successive words or syllables. Pope. [ 1913 Webster ]