Strong's 736 (ἀρτέμων)

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mainsail

properly, something ready (or else more remotely from G142 (αἴρω) (compare G740 (ἄρτος)); something hung up), i.e. (specially) the topsail (rather foresail or jib) of a vessel

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from a derivative of G737 (ἄρτι);