IN a transdeletion, one or more letters are subtracted from a word and the remaining letters rearranged (if necessary) to form a new word. In a transaddition, one or more letters are added to a word to supply the letter-stock for a new word. The goal in each case is usually to transform one word into another with the fewest possible subtractions or additions of letters.
"The Presidents, More Or Less,"
Word Ways: Vol. 31
, Article 6.
Available at: http://digitalcommons.butler.edu/wordways/vol31/iss3/6