Bituminous/bɪˈtuːmɪnəs/ Definition 1 of 2Pro Tip 1/3Construction Context Remember, 'bituminous' often relates to road construction and surfacing Our town's main street is layered with a smooth bituminous coating. Pro Tip 2/3Sticky Texture Think of 'bituminous' as something sticky and thick, like tar or heavy oil. Workers poured the bituminous substance carefully to patch the potholes. Pro Tip 3/3Dark Appearance 'Bituminous' materials are usually dark, reflecting the dense composition. The new parking lot has a fresh bituminous surface that's nearly black.