olfactory receptor morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the proteins, usually projecting from the cilia of olfactory receptor neurons, that specifically bind odorant molecules and trigger responses in the specialized neurons of the olfactory epithelium. Trait.ontology VT:0001003 olfactory receptor protein morphology trait olfactory system morphology trait olfactory neuron morphology trait