The word "pental" is spelled with five letters, but pronounced with only two sounds. The first sound, /p/, is produced by releasing a burst of air from the lips. The second sound, /ɛntl/, consists of three vowel sounds pronounced quickly in sequence: /ɛ/ (as in "bed"), /n/ (as in "no"), and /tl/ (a combination of the "t" and "l" sounds). In IPA phonetic transcription, "pental" is written as /pɛntl/. Despite its short length, this word presents unique spelling and pronunciation challenges.
Trimethylethylene, a pure form of amylene; a colorless, volatile liquid, with an odor of mustard; used as a general anesthetic, especially in dentistry.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.