breast
mastos, mazos denotes breasts, especially in references to nursing, and also marks the chest area where a belt is worn.
The attested uses refer chiefly to breasts in statements about nursing, while Revelation 1:13 uses the plural in locating a golden belt around the chest.
Senses in use
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Breasts in references to nursing · dominant
The nominative plural occurs with the womb and nursing in Luke 11:27, where the APB renders the clause "the breasts at which you nursed." In Luke 23:29, the same form occurs in the contrast with barren women and wombs that did not bear; the APB renders "the breasts that did not nurse."
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Chest area where a belt is worn · occasional
The dative plural in Revelation 1:13 marks the bodily location of a golden belt. The APB renders the figure as "girded around the chest with a golden belt,".
In the Anselm Project Bible: The APB presents the term as "breasts" in Luke 11:27 and Luke 23:29, both in nursing-related clauses, and as "chest" in Revelation 1:13. The latter rendering indicates the verse's bodily location rather than a precise lexical equivalence.