amoxicillin: an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections
penicillin: any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases
assurance: a binding commitment to do or give or refrain from something