Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Sinus

（κόλπος). Literally any surface bent into a hollow or semicircular form. Hence

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1.

a loose fold in a garment, usually made so as to lie across the breast (hence sinus, also meaning the breast), and used as a pocket for carrying any small object, as a letter, a purse, etc. (Verr. i. 5, 57);

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2.

the bosom of a sail;

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3.

a bay or gulf on a coast;

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4.

a round vessel for wine or milk. See Sinum.