Etymology
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marionette (n.)

"a puppet worked by strings," c. 1620, literally "little little Mary," from French marionette (16c.), diminutive of Old French mariole "figurine, idol, picture of the Virgin Mary," itself a diminutive of Marie (see Mary). For ending, see -ette.

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Muppet (n.)

type of glove-and-rod puppet, trademark (U.S.) Sept. 26, 1972, claiming use from 1971, but in print from Sept. 1970. Coined by creator Jim Henson (1936-1990), who said, despite the resemblance to marionette and puppet (they have qualities of both), it has no etymology; he just liked the sound.

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