'navel orange' definitions:

Definition of 'navel orange'

From: WordNet
noun
Seedless orange enclosing a small secondary fruit at the apex

Definition of 'navel orange'

From: GCIDE
  • 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. [Webster 1913 Suppl.]