Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: a virus (as Rous sarcoma virus) that causes neoplastic or cancerous growth
Share tumor virus
Resources for tumor virus
tumor necrosis factor
tumor suppressor gene
Comments on tumor virus
What made you want to look up tumor virus? Please tell us where you read or heard it (including the quote, if possible).
an open space surrounded by woods
Get Word of the Day daily email!
Name that Food Quiz
Test your vocabulary with our 10-question quiz!
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 9/14/2018
For frog-tossing, sword dancing, & more
That dessert might kill you
How a folk song became a term of derision.
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Test your knowledge of food and food words.
A quiz in common time.
SCRABBLE® fans, sharpen your skills!