| Definition -
A word whose spelled form contains a synonym of itself. For example, regulate (rule) and indolent (idle).
1. The internal synonym is called a joey. Note that to be a proper joey the word should be the same part of speech as the kangaroo word, and its letters should appear in order.
Etymology - The term kangaroo word was popularized by author Ben L. O'Dell in an 1956 article in The American Magazine (v. 151, 1956).