Entry 1 sense Webster, 1913 Tubulure · Tu·bu·lure · IPA /ˈtjuːbjʊlʊə(ɹ)/ 01 n. A short tubular opening at the top of a retort, or at the top or side of a bottle; a tubulation. 1. A short tubular opening at the top of a retort, or at the top or side of a bottle; a tubulation.(Chem.)