An acetyloxy is a radical, CH3COO-, common to acetate esters.
No, aspirin is not an acid in terms of acidity strength. Aspirin is a weak acid called acetylsalicylic acid. Strong acids like hydrochloric acid have a much lower pH and can fully dissociate in solution.
Aspirin is a white crystalline powder with a melting point of 135°C. The common chemical name for aspirin is acetylsalicylic acid. Its systematic name is 2-(acetyloxy)benzoic acid. The chemical formula of aspirin is C9H8O4.