Two words which begin with the same letter, or group of letters, are beheaded i.e. the common letter/letter group is removed. The two remaining sets of letters are joined to form a word. I set a minimum of 5 letters for this word.
"Beheading and Joining,"
Word Ways: Vol. 48
, Article 22.
Available at: http://digitalcommons.butler.edu/wordways/vol48/iss1/22