One of the mysteries of the English language finally explained.
A substance which has the physiological effect of relaxing muscles.
Usually with hyphen. Especially of a drug: that has the effect of relaxing muscles.
1940s; earliest use found in The Lancet. As noun from muscle + relaxant. As adjective from muscle + relaxant.
muscle relaxant/ˈmʌsl rɪˌlaksnt/
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