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periodoscope

noun
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pe·​ri·​od·​o·​scope | \ ˌpirēˈädəˌskōp \

Definition of periodoscope

: a table or dial for calculating the probable date of parturition

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History and Etymology for periodoscope

period entry 1 + -o- + -scope

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“Periodoscope.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/periodoscope. Accessed 3 Jun. 2020.

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