Mathematician echoing a sort of ship (5)

I believe the answer is:

euler

(Other definitions for euler that I've seen before include "Leonhard --, C18 Swiss mathematician" , "calculating foreigner" , "Leonhard -, C-eighteen Swiss mathematician" , "Noted blind Swiss mathematician" , "Leonhard -, Eighteenth century Swiss mathematician" .)

I've seen this clue in the Newsday.

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