thaumatrope (plural thaumatropes)
A toy made of a card with an image on each side; when twirled, the images combine.
A zoetrope.
Source: Wiktionary
Thau"ma*trope, n. Etym: [Gr. (Opt.)
Definition: An optical instrument or toy for showing the presistence of an impression upon the eyes after the luminous object is withdrawn.
Note: It consists of a card having on its opposite faces figures of two different objects, or halves of the same object, as a bird and a cage, which, when the card is whirled rapidlz round a diameter by the strings that hold it, appear to the eye combined in a single picture, as of a bird in its cage.
Source: Webster’s Unabridged Dictionary 1913 Edition
21 January 2025
(verb) follow, discover, or ascertain the course of development of something; “We must follow closely the economic development is Cuba”; “trace the student’s progress”; “trace one’s ancestry”
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