Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: a sulcus of the tentorial surface of the cerebrum lying below and external to the calcarine sulcus and causing an elevation on the floor of the lateral ventricle between the hippocampi
Share collateral sulcus
Resources for collateral sulcus
Comments on collateral sulcus
What made you want to look up collateral sulcus? Please tell us where you read or heard it (including the quote, if possible).
exaggeratedly or childishly emotional
Get Word of the Day daily email!
Words from Greek and Roman Mythology 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 can be hard to pin down
Just add an 'E.'
And if so, what about 'never'?
Words from the week of 10/19/2018
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'
A mythological/etymological mashup!
Words to improve your Scrabble game
A game of winding words.