Main definitions of -th in US English:

: -th1-th2-th3

-th1

(also -eth)

suffix

  • Forming ordinal and fractional numbers from four onwards.

    ‘fifth’
    ‘sixty-sixth’

Origin

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

Pronunciation

-th

/θ/

Main definitions of -th in US English:

: -th1-th2-th3

-th2

suffix

  • 1(forming nouns from verbs) denoting an action or process.

    ‘birth’
    ‘growth’
  • 2(forming nouns from adjectives) denoting a state.

    ‘filth’
    ‘health’
    ‘width’

Origin

Old English -thu, -tho, -th.

Pronunciation

-th

/θ/

Main definitions of -th in US English:

: -th1-th2-th3

-th3

suffix

  • variant spelling of -eth (as in doth)