koinobiont adjective 1noun 1forms 1 adjective1 •Whose host continues to feed and grow after parasitization. noun1 •A parasitoid whose host continues to feed and grow after parasitization.Not many koinobionts are ectoparasitoids, although a number of ichneumonoids (e.g. Tryphoninae; Adelognathinae; Polysphinctini; some Rogadinae) and a few eulophids are (Plate 1). — 1988 formskoinobionts