Same entry in ps.-Zonaras and, according to Adler, the Ambrosian Lexicon. (Hesychius has the same headword but different glossing.) The headword is either masculine/feminine accusative singular or neuter nominative/accusative singular of this adjective. It must be quoted from somewhere -- perhaps Xenophon, Lakedaimonion Politeia 15.7 (on the Spartan monarchy), though there are other possibilities.