Present active participle, masculine nominative plural, of sto/rnumi. It is almost certainly extracted from one of only two extant instances outside the present entry, Herodotus 7.54 (web address 1): Xerxes' troops at the Hellespont were 'strewing the way with myrtle-boughs'. (The other instance is in Strabo.)
Entry lacking, Adler reports, in mss AF.