To save this word, you'll need to log in.
Definition of goo
1 : a viscid or sticky substance
2 : sentimental tripe
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Semantic Drift Quiz
- Which of the following was once a synonym for fun?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share goo
Time Traveler for goo
The first known use of goo was in 1900
See more words from the same year