Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: concavus, from com- ( COM-) + cavus 'hollow'

concave

 adjective
     
Related topics: Technology
con‧cave
T a concave surface is curved inwards in the middle [≠ convex]:
a concave lens
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary

Browse the dictionary