Definition of "bellybutton" [bel•ly•but•ton]

• Informal The navel; the umbilicus. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "May 07, 2008 cheesefairy said ... oh - pregnant bellybutton is terrifying. to think I once flaunted mine, with jewels no less. now it looks like an escaping alien. and I gave birth 2 weeks ago! nothing in there but guts!"
• "When we ask you what time it is (in either Spanish or English) you look up to the clock, and when we say "bellybutton" you grab your navel and laugh."
• "· The pain often begins around the navel ( 'bellybutton'), but it soon moves to the lower right side."