Dictionary Definition:
dvā́-daśan pl. (nom. acc. dvā́-daśa, instr dvā daśábhis, dat. abl. ○śábhyas, loc' ○śâsu gen. śā́nām, according to Pāṇ. 6-1, 179, 180 in Class. also ○śabhís, ○śabhyás, ○śasú) twelve RV. &c. [Cf. Zd. dva-daśan • Gk.? ; [503, 3] Lat. duo-decim