资料来源 : Webster's Revised Unabridged Dictionary (1913)

Nauheim bath \Nauheim bath\, etc. Navel orange \Na"vel or"ange\
   A type of orange in which the fruit incloses a small
   secondary fruit, the rind showing on the exterior a
   navel-like pit or depression at the apex. There are several
   varieties; they are usually seedless, or nearly so, and are
   much grown in California.

资料来源 : WordNet®

navel orange
     n : seedless orange enclosing a small secondary fruit at the
         apex