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Related to fingerbreadth: put finger on
The breadth of one finger.
fingerbreadth(ˈfɪŋɡəˌbrɛdθ; -ˌbrɛtθ) or
(Units) the width of a finger, used as an indication of length
fin•ger•breadth(ˈfɪŋ gərˌbrɛdθ, -ˌbrɛtθ)
the breadth of a finger: approximately ¾ in. (2 cm).