-eth 1
an ending of the third person singular present indicative of verbs, now occurring only in archaic forms or used in solemn or poetic language: doeth or doth; hopeth; sitteth.
Also, -th .
[ OE -eth, -ath, -oth, -th; akin to L -t ]
-eth 2
var. of -th 2 , the ordinal suffix, used when the cardinal number ends in -y: twentieth; thirtieth.