Unda Maris

Un·da Mar·is | \ ˈəndəˈma(a)rə̇s \

Definition of Unda Maris 

: an organ flue stop of 8' pitch with pipes tuned slightly sharp or flat either to another rank in the stop or to the rest of the organ to produce a wavering or undulating effect

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History and Etymology for Unda Maris

New Latin, literally, wave of the sea

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occurring twice a year or every two years

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