Definitions

1. noun

A cell that ingests foreign particles or microorganisms, especially a phagocyte that has been stimulated to engulf an antigen.

“Macrophages act as opsonists to help protect the body from infections.”

2. noun

An organism that consumes other organisms or their parts as a means of obtaining nutrients.

“In some ecosystems, certain insects can be classified as opsonists due to their unique feeding behavior.”