noun
bicep
BEYE-sehp
noun
1
Informal singular form of "biceps," the muscle at the front of the upper arm.
"He pulled a bicep lifting the couch."
How to Use Bicep
Learner’s notesIn plain EnglishThe everyday singular form of biceps, even though strictly the word "biceps" is already singular.
Common mistake
Grammar purists prefer "biceps" even for one arm, but "bicep" is now standard in casual speech.
Easily confused with
Word Forms
biceps plural
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He pulled a _____ lifting the couch.
Etymology
A back-formation from "biceps" — in Latin, biceps is already singular ("two-headed"), but English speakers reinterpreted the final "-s" as a plural marker and invented "bicep" as the singular.