Adler reports that this entry is absent from mss AF, but is written in the margin of A in a more recent hand.
The headword, transliteration of a Latin term found in sources of the imperial era, is here nominative singular. It may be extracted from a literary source or it may be a generic lexical reference. For an independent definition of the same term cf. Etymologicum Magnum 718.58-719.3 (not Adler's '718.56').
[1] While a straightforward enough definition of the term, this phrase may also be an attempt to etymologize it as from (Latin) scrinium and the Greek verb ai)/rw ('take', 'carry').