The headword is the later spelling of a feminine noun in the nominative (and vocative) singular. It is evidently extracted from the following quotation where it appears in a late form of the accusative singular; cf. LSJ s.v. quei/a (web address 1).
[1] cf. theta 540.
[2] Greek Anthology 6.306.7-8 (Ariston): a list of culinary equipment dedicated to Hermes; cf. Gow and Page, vol. I (42-43); vol. II (110-111); and further excerpts from this epigram at alpha 1146, alpha 4064, beta 34, mu 11, pi 3007, tau 73, tau 74, tau 799, chi 620, and omega 294. The Suda renders the epigram with the headword's later spelling as given by the Anthologia Palatina (AP), whereas Gow and Page (vol. I, 43), following the emendation of the AP scribe designated C (the Corrector) and the text of the Anthologia Planudea, adopt the Attic Greek spelling quei/an.