beloniform adjective 1noun 1forms 3 adjective1 •Of or pertaining to the order Beloniformes.However, the loss of the uncinate process is not unique for cyprinodontiforms, but instead synapomorphic for a clade comprising of cyprinodontiforms and beloniforms (Rosen & Parenti, 1981). — 1998 noun1 •Any fish in the order Beloniformes formsbeloniforms · more beloniform · most beloniform