Strong's 203 (ἀκροβυστία)

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not circumcised, uncircumcised (with G2192 (ἔχω)), uncircumcision

the prepuce; by implication, an uncircumcised (i.e. gentile, figuratively, unregenerate) state or person

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from G206 (ἄκρον) and probably a modified form of (the penis or male sexual organ);