There are 2 definitions of -eth in English:

-eth1

suffix

Variant spelling of -th1 (as in fiftieth).

Definition of -eth in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of -eth in English:

-eth2

(also -th)

suffix

archaic
Forming the third person singular of the present tense of verbs: doeth saith

Origin

Old English -eth, -ath, -th.

Definition of -eth in: