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periodoscope

noun
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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Dictionary Entries near periodoscope

periodontics

periodontitis

periodontology

periodoscope

period piece

perioeci

perioecian

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