-th

-th¹

a suffix forming nouns of action (birth) or abstract nouns denoting quality or condition (depth; length; warmth).

[ME -th(e), OE -thu, -tho, -th (var. -t after a velar, f, or s); c. Goth -itha, L -tus, Gk -tos]

-th²

a suffix used in the formation of ordinal numbers (fourth, tenth), in some cases, added to altered stems of the cardinal (fifth; twelfth).

[ME -the, -te, OE -tha, -the (var. -ta after f or s); c. ON -thi, -di, L -tus, Gk -tos; see -ETH]

-th³

var. of -eth¹: doth.

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