The unglossed headword [in Adler; the SOL version wrongly gives 'Myronides', on which see below], evidently quoted from somewhere, is genitive case of the proper name Myron; perhaps an internal cross-reference from lambda 807; alternatively from somewhere like Herodotus 6.126.1.
Added is the name Myronides: ostensibly a patronymic; in practice a proper name in its own right (e.g. that of an Athenian general of the C5 BCE).