Reference > Brewer’s Dictionary > Lens (Latin, a lentil or bean).

 Length-month.Lenson. 
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E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
 
Lens (Latin, a lentil or bean).
 
Glasses used in mathematical instruments are so called because the double convex one, which may be termed the perfect lens, is of a bean shape.   1
 


 Length-month.Lenson. 

 
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