Etymology
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gyro (n.)
sandwich made from roasted lamb, 1971, originally the meat itself, as roasted on a rotating spit, from Modern Greek gyros "a circle" (see gyre (n.)). Mistaken in English for a plural and shorn of its -s.
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gyrostat (n.)
instrument for illustrating the dynamics of rotation, 1868, from gyro- + -stat.
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hero (n.2)
1955, the New York City term for a sandwich elsewhere called submarine, grinder, poor boy (New Orleans), or hoagie (Philadelphia); origin unknown, perhaps so called for its great size (from hero (n.1)), or a folk-etymology alteration of Greek gyro as a type of sandwich.
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gyro- 
word-forming element meaning "gyrating" or "gyroscope," from Greek gyros "a ring, circle" (see gyre (n.)).
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gyromancy (n.)
1550s, method of divination said to have been practiced by a person walking in a circle marked with characters or signs till he fell from dizziness, the inference being drawn from the place in the circle at which he fell; from Medieval Latin gyromantia, from Greek gyyros "circle" (see gyro- (n.)) + manteia "divination, oracle" (see -mancy).
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