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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
Internal rhyme

In poetry, internal rhyme, or middle rhyme, is rhyme that occurs within a single line of verse, or between internal phrases across multiple lines. By contrast, rhyme between line endings is known as end rhyme.

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.