Tubular/ˈtuːbjələr/ Definition 1 of 5Pro Tip 1/2Visual Association Envision common tube-shaped items to grasp the concept. She described the cookie container as tubular. Pro Tip 2/2Avoid Confusion Don't confuse 'tubular' with 'tub' like in bathtubs, which is broader. Unlike a tub, the tubular rail is long and narrow.