-biont, comb. form Biol.
Brit. /ˈbʌɪɒnt/, U.S. /ˈbaɪˌɑnt/
[Irregularly > comb. form), probably after symbiont n. and formations in -ont comb. form.]
Affix. Forming nouns denoting kinds of living organism, esp. with reference to particular modes of life, as haplobiont, photobiont, protobiont.