Dictionary.com

bellybutton

or bel·ly but·ton

[ bel-ee-buht-n ]
/ ˈbɛl iˌbʌt n /

noun

the navel.

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Origin of bellybutton

An Americanism dating back to 1875–80; belly + button
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for bellybutton

bellybutton
/ (ˈbɛlɪˌbʌtən) /

noun

an informal name for the navel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for bellybutton

bellybutton
[ bĕl′ē-bŭt′n ]

n.

navel
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.