Internal Isomorphs are what I call words which can be cut into 2 or more sections, each with an equal number of letters, and with identical letter patterns with reference to the number and position of repeated letters. Vowels and consonants are not differentiated. Thus the surname of the British Prime MInister (1945-51), CLement ATT.LEE is an internal isomorph.
Word Ways: Vol. 39
, Article 16.
Available at: http://digitalcommons.butler.edu/wordways/vol39/iss2/16