Longman Dictionary of Contemporary English homepage

Sense: 1
Origin: Old English scolu 'large group'
Sense: 2
Date: 1300-1400
Origin: shoal 'not deep' (11-20 centuries), from Old English sceald

shoal

 noun
     
Related topics: Oceanography
shoal [countable]
1 a large group of fish swimming together [= school]
shoal of
a shoal of fish
2HEO a small hill of sand just below the surface of water that makes it dangerous for boats
Definition from the Longman Dictionary of Contemporary English
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