Bulbourethral gland: A pea-sized gland in the male located behind and to the side of the urethra that discharges a component of seminal fluid into the urethra. There are two bulbourethral glands, one on each side. Also known as the Cowper's gland. From Healthy Men What's Hiding in Your Laundry?What's Your BMI? Calculate It HereFast Relief From Migraines: CGRP Inhibitors Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew