The Collaborative International Dictionary of English v.0.48:
Lunitidal \Lu"ni*tid`al\, a. Pertaining to tidal movements dependent on the moon. --Bache. [1913 Webster] Lunitidal interval. See Retard, n. [1913 Webster]WordNet (r) 3.0 (2006):
lunitidal interval n 1: interval between the moon's transit of a particular meridian and the next high tide at that meridian