[1] The headword, a single compound word in the Greek, is attested only in the Suda and, with the same glossing phrase, Hesychius alpha397; LSJ entry at web address 1. The second element of the compound could be related to ph=nos "web" and ph/nh "woof, bobbin-thread." The first part comes from a/ggos "vessel."
[2] For this adjective (attested in e.g. Euripides, Orestes 840) see LSJ s.v.