Term: penicillin-resistant bacteria: bacteria that are unaffected by penicillin
Broader: bacteria: (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Unrelated: footbath: a small bathtub for warming or washing or disinfecting the feet