Waves overhead?

This crossword clue is for the definition: Waves overhead?.
it’s A 15 letters crossword puzzle definition.
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Possible Answers: PERM.

Last seen on: LA Times Crossword 14 Oct 18, Sunday

Random information on the term “PERM”:

Great Perm (Russian: Пермь Великая), or simply Perm, Latinised Permia, was a medieval Komi state in what is now the Perm Krai of the Russian Federation. Cherdyn is said to have been its capital.[1]

The origin of the name Perm is uncertain. While the city of Perm is a modern foundation named for Permia, the town of Cherdyn was reportedly itself known as “Great Perm” in the past. Cherdyn acted as a central market town, and it is sometimes suggested that perm was simply a term for “merchants” or “market” in a local language,[2] but there have been other suggestions.[3] The same name is likely reflected in the toponym Bjarmaland in Norse sagas.[4] The general region of Great Perm was known as wisu (وِيسُو wīsū) in medieval Arab ethnography, so referred to in the works of Ahmad ibn Fadlan, Al-Gharnati, Zakariya al-Qazwini and Yaqut al-Hamawi (in his Dictionary of Countries). The term is perhaps derived from the name of the Ves’ people who settled around Lake Ladoga and the upper Sukhona River.[5]

PERM on Wikipedia