Webster's Revised Unabridged Dictionary · 1913

Periodoscope

Periodoscope , noun

[Period + -scope.]

(Medicine) A table or other means for calculating the periodical functions of women. — Dunglison

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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