Wiktionary
internal rhyme
n. The rhyming of words (in modern English poetry) or of stressed syllables (in old Germanic poetry) within the same line of a verse.
WordNet
internal rhyme
n. a rhyme between words in the same line
Wikipedia
Usage examples of "internal rhyme".
His interpolated phrase, with its awkward internal rhyme and its pointlessness, bothered everybody, but in a subliminal, preconscious fashion.
He chuckled, then found the internal rhyme even funnier and almost rolled backward as he laughed at himself.