1. one that infests; something that overruns or inhabits in large numbers so as to be harmful or unpleasant

Examples

• The exterminator identified the cockroach as the primary infester in the apartment building.
• Rats became the main infester of the old warehouse.
• The garden suffered from aphids, a common infester of rose bushes.
• Termites are a destructive infester that can damage wooden structures.
• The health inspector found evidence of multiple infesters in the restaurant kitchen.
• Fleas can be a persistent infester of household pets.