superbug

Short definition from Wiktionary

Noun

1. 1
   A strain of bacteria that is resistant to many antibiotics (e.g., MDR, XDR).
2. 2
   Any pathogen resistant to many, even all, of the biocides or other agents used to treat similar pathogens.
3. 3
   An invasive insect, Bemisia tabaci, that is a major pest of vegetable crops, both directly and as a virus vector.