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There are 3 seven-letter words beginning with OTO

OTOCYSTotocyst n. (Invertebrate zoology) An organ involved in balance and orientation.
otocyst n. (Vertebrate embryology) The precursor of the inner ear.
OTOCYST n. an organ of balance in many invertebrates.
OTOLITHotolith n. (Zoology) A small particle, comprised mainly of calcium carbonate, found in the inner ear of vertebrates…
OTOLITH n. a calcium concretion in the inside of a vertebrate's ear to aid in equilibrium.
OTOLOGYotology n. (Medicine) The branch of medicine that deals with the ear, its structure, function and pathology.
OTOLOGY n. the science of the ear.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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