Noun
fluctus (plural fluctus or flucti)
(astronomy, geology) An area covered by outflow from a volcano.
Etymology The word "flood" comes from the Old English flod, a word common to Germanic languages (compare German Flut, Dutch vloed from the same root as is seen in flow, float; also compare with Latin fluctus, flumen). Source: Internet
This phenomenon has also been observed in cloud formations over other planets and even in the sun's atmosphere. citation It has been formally suggested that this wave cloud be classified as a supplementary feature, possibly with the Latin name fluctus. Source: Internet