| Word | Definitions | Synonyms |
|---|---|---|
| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
| actor | (noun) a theatrical performer | Synonyms: histrion, player, role player, thespian |
| (noun) a person who acts and gets things done | Synonyms: doer, worker |