In poetry, internal rhyme, or middle rhyme, is rhyme that occurs within a single line of verse, or between internal phrases across multiple lines.[1][2] By contrast, rhyme between line endings is known as end rhyme.
Internal rhyme schemes can be denoted with spaces or commas between lines. For example, "ac,ac,ac" denotes a three-line poem with the same internal rhyme on each line, and the same end rhyme on each line (which does not rhyme with the internal rhyme).