Definition of U-boat

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U-bolt >

U-boat  (ybt) KEY 

NOUN:

A submarine of the German navy.

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ETYMOLOGY:
Translation of German U-Boot, short for Unterseeboot : unter, under (from Middle High German under, from Old High German untar; see dher- in Indo-European roots) + See, sea (from Middle High German s, from Old High German) + Boot, boat