This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One who is an expert in or has a keen sense of rhythm.

n. Music One who studies or produces rhythm.

n. One who composes in rhythm; a rhythmical composer.

n. One versed in the theory of rhythm; a writer on the science of rhythmics.

"To the metrist and rhythmist the poem will be of interest from the first, and throughout."