TRIPHTHONG n.
A combination of three vowel sounds in a single syllable, forming a simple or compound sound; also, a union of three vowel characters, representing together a single sound; a trigraph; as, eye, -ieu in adieu, -eau in beau, are examples of triphthongs.
TUBULAR a.
Tubular boiler. See under Boiler. -- Tubular breathing (Med.), a variety of respiratory sound, heard on auscultation over the lungs in certain cases of disease, resembling that produced by the air passing through the trachea. -- Tubular bridge, a bridge in the form of a hollow trunk or tube, made of iron plates rive…