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period +‎ -scope


periodoscope (plural periodoscopes)

  1. (medicine) A table or other means of calculating the menstrual cycle.
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Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for periodoscope in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)