retentorEtymologyBorrowed from Latin retentor, from retentare, from retinere (“retain, hold back”), from re- + tenere.retentor means A muscle which holds a body part in place, notably in extended or retracted position. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA muscle which holds a body part in place, notably in extended or retracted position