The entry, in nominative singulars, derives from commentary to Homer, Odyssey 17.224, where the accusative singular form of the headword noun occurs (relating to 'pen' in the sense of animal enclosure). This is the only literary attestation of the word in any form: cf. the scholia to that line; Apollonius Sophistes, Homeric Lexicon 141.10 (s.v. shko/s); Hesychius sigma484; Pollux 7.141. Adler also cites Lexicon Ambrosianum, which she characterizes as equivalent to ps.-Zonaras 1638; there the headword is defined as 'he who is in charge of the temple', exhibiting an alternative connotation of the noun from which the headword arises, shko/s (cf. Etymologicum Magnum 710.56 and Eustathius, Commentary on the Odyssey 2.142.26).
For related words see sigma 299, sigma 300, sigma 302 and sigma 303.