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deflectometer

noun
de·​flec·​tom·​e·​ter | \ də̇ˌflekˈtämətə(r), (ˌ)dēˌ-\

Definition of deflectometer 

: an instrument for measuring minute deformations in bodies under transverse stress — compare extensometer sense 2

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History and Etymology for deflectometer

deflect + -o- + -meter

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