thumb-sucking

noun
thumb-suck·​ing | \-ˌsək-iŋ \

Medical Definition of thumb-sucking 

: the habit especially of infants and young children of sucking a thumb

Learn More about thumb-sucking

Share thumb-sucking

Dictionary Entries near thumb-sucking

thulium

thumb

thumb-sucker

thumb-sucking

thumps

thylakentrin

thyme

Comments on thumb-sucking

What made you want to look up thumb-sucking? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

playful or foolish behavior

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!