[1] Likewise or similarly in other lexica (references at Photius upsilon338 Theodoridis). This present participle is presumably quoted from somewhere; there are numerous possibilities. For forms of the headword verb u(/w 'rain', similarly glossed, cf. already upsilon 73, upsilon 121, upsilon 126.
[2] cf. upsilon 76. (Addendum lacking, Adler reports, in mss AF, but a marginal addition in A and V.)