There are 3 main definitions of -th in English:

-th1

(also -eth)

suffix

Forming ordinal and fractional numbers from four onwards: fifth sixty-sixth

Origin

Old English -(o)tha, -(o)the.

Definition of -th in:

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There are 3 main definitions of -th in English:

-th2

suffix

Forming nouns:
1(From verbs) denoting an action or process: birth growth
2(From adjectives) denoting a state: filth health width

Origin

Old English -thu, -tho, -th.

Definition of -th in:

There are 3 main definitions of -th in English:

-th3

suffix

Variant spelling of -eth2 (as in doth).

Definition of -th in: