triphthong /trifˈthong, tripˈ/

1. A combination of three vowel sounds in one syllable (phonetics)
2. (loosely) a trigraph

triphthongal /-thongˈgl/ adjective

• parallelogram of forces
• parallelograms
• parallelopiped
• parallelopipedon
• parallelopipeds
• parallel port
• parallel ports
• parallel processing
• parallel ruler
• parallel rulers
• parallels
• parallel slalom
• parallel turn
• parallel turns
• parallel-veined
• parallelwise
• paralogia
• paralogias
• paralogise
• paralogised
• paralogises
• paralogising
• paralogism
• mother superior
• mother superiors