
(from the article `Earth tide`) ...were it perfectly rigid, there would be no Earth tides. Several tidal components mathematically can be shown to exist, but only four are large ... ...an inequality of the two successive cycles within the time interval of 24 hours 50 minutes. The effect of this inequality is formally described as ... ...
Found on
http://www.britannica.com/eb/a-z/d/58

A tide in which there is only one high water and one low water each lunar day .
Found on
http://www.encyclo.co.uk/local/20124

Tides that have one high and one low water per tidal period.
Found on
http://www.physicalgeography.net/physgeoglos/d.html
No exact match found.