dvā-daśa and -daśan, see below.
dvā́-daśan pl. (nom. acc. dvā́-daśa, instr. dvā daśábhis dat. abl. °śábhyas, loc. °śāsu gen. śā́nām, according to [Pāṇ. vi, 1, 179], [180] in Class. also °śabhís, °śabhyás, °śasú) twelve, [RV.] &c.
[cf. Zd. dva-daśan; Gk.δώ-δεκα; Lat. duo-decim.]