音第叱

Etymology
Because it is followed by what appears to be the genitive marker, is probably a bound noun. Thus may have been the original ordinal-deriving suffix, with  added at some later point. See a possible Modern Korean reflex of *-m in,.

Suffix

 * 1) -th

Reconstruction notes
and are well-accepted Old Korean phonograms for coda consonants *-m and *-s respectively. The Old Korean orthography gives no clues as to how is supposed to be read, as it is being used solely as a logogram for its semantic value here (see Chinese ), but it is conventionally reconstructed as *CAHI, because it appears to be a bound noun and Middle Korean features the ordinal-deriving bound noun, which became Modern Korean  with the same function. Note that there is no actual evidence for this reconstruction of convenience.

In Middle Korean, *-m and *-s have both disappeared. combines to the number via an intervening genitive particle, and is directly followed by the noun.