[Ox-]hide.
Ômoboïnas: bursas.
The entry defines a rare adjective (given in the acc.pl.fem.), which describes hides used in making light shields (so e.g.
Herodotus 7.76 and 79 -- web address 2 -- and several times in the
Anabasis of
Xenophon), among other things. LSJ entry at web address 1.