vomeronasal organvo·mer·o·na·sal organ
either of a pair of olfactory sense organs typically in the nasal cavity or mouth of reptiles, amphibians, and some mammals
Origin of vomeronasal organvomer + -o- + nasal
Either of two olfactory sense organs, found near the vomer in certain amphibians, reptiles, and mammals, that detect pheromones and other chemical compounds. In humans, these organs regress during fetal development. Also called Jacobson's organ.