-e·​us | \ēəs\
plural -ei\ēˌī \ also -euses

Definition of -eus 

: muscle that constitutes, has the form of, or joins a (specified) part, thing, or structures gluteus rhomboideus iliococcygeus

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History and Etymology for -eus

New Latin, from Latin, adjective suffix, composed of, of the nature of, or resembling (a specified substance)

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to enclose within walls

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