cf. epsilon 505, epsilon 506, and mu 981.
[1] Present middle participle, feminine nominative singular, of the verb mhru/omai. From the Biblical book of Proverbs 31.13 LXX (describing the fabric-making skills of the wife whose price is above rubies). Likewise or similarly in other lexica.
[2] See Homer, Odyssey 12.170, "they furled the sails" (i(sti/a mhru/santo) -- but there and elsewhere, in all senses, the verb is regularly used in the middle voice, not this active.