Longman Dictionary of Contemporary English homepage

Sense: 1
Date: 1800-1900
Origin: quadrangle
Sense: 2
Date: 1800-1900
Origin: quadruplet
Sense: 3
Date: 1900-2000
Origin: quadriceps

quad

 noun
     
Related topics: Human, Education
quad [countable]
1SE informal a square open area with buildings all around it, especially in a school or college
2HBH informal a quadruplet
3

quads

[plural] informal quadriceps
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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