Webster's 1913 Dictionary
T'OTHER
T'OTHER T'oth "er.
Defn: A colloquial contraction of the other, and formerly a contraction for that other. See the Note under That, 2. The tothir that was crucifield with him. Wyclif (John xix. 32 )
New American Oxford Dictionary
t'other
t'oth er |ˈtəT͟Hər ˈtəðər |(also tother ) ▶adjective & pronoun dialect or humorous the other: [ as adj. ] : I was talking about it t ῾other day | [ as pronoun ] : we were talking of this, that, and t ῾other. ORIGIN Middle English the tother, wrong division of thet other ‘the other ’ ( thet, from Old English thaet, the obsolete neuter form of the ).
Oxford Dictionary
t'other
t'other |ˈtʌðə |(also tother ) ▶adjective & pronoun dialect or humorous the other: [ as adj. ] : we was talking about it t'other day | [ as pronoun ] : we were talking of this, that, and t'other. PHRASES tell t'other from which Brit. humorous tell one from the other. ORIGIN Middle English the tother, wrong division of thet other ‘the other ’ ( thet, from Old English thaet, the obsolete neuter form of the ).
The Wordsmith Dictionary