Putnam scale

Put·nam scale | \ ˈpətnəm- \
variants: or less commonly Putnam's scale

Definition of Putnam scale 

: a scale (Aspidiotus ancylus) that feeds on various trees and shrubs throughout most of the U.S.

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History and Etymology for Putnam scale

probably from the name Putnam

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occurring twice a year or every two years

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