The elusive 'th' sound that most of the world's languages simply ignore
In short: You likely use the voiced dental fricative every day when saying the word 'father.' Yet, this specific sound is a linguistic rarity. Most languages across Europe and Asia lack it entirely, leading speakers to substitute it with much more common sounds like 'd' or 'v'.
In the International Phonetic Alphabet, this sound is represented by the symbol eth (ð), a character borrowed from Old English and Icelandic alphabets. While the letter was once used interchangeably with thorn (þ) in Old English to represent both voiced and unvoiced sounds, Icelandic has since refined this usage, reserving eth specifically for the voiced version and thorn for the unvoiced counterpart. The sound is often called 'interdental' because it is frequently produced by placing the tongue between the upper and lower teeth.
Despite its familiarity to English speakers, the voiced dental fricative is a rare phoneme. Most of Mainland Europe and Asia do not include it in their consonant inventories. When speakers of languages without this sound encounter it, they often perform specific phonetic substitutions. These include 'th-stopping' (replacing it with a 'd' sound), 'th-alveolarization' (using a 'z' sound), or 'th-fronting' (using a 'v' sound). However, certain 'periphery' languages like Greek do maintain the sound, and it appears in Turkic languages such as Bashkir and Turkmen, as well as in some Semitic languages like Modern Standard Arabic and certain dialects of Hebrew and Assyrian.
The mechanics of the sound are precise: it is a pulmonic, oral, and median consonant. This means it is produced using air pushed by the abdominal and intercostal muscles, without air escaping through the nose, and with the airstream directed down the midline of the tongue. It is a fricative, meaning it creates turbulence by constricting airflow through a narrow channel, but unlike sibilants, it lacks high-frequency grooves. Interestingly, the symbol (ð) is sometimes used for a similar 'voiced dental approximant,' a sound that some languages use, though no language is known to contrast it with a dental non-sibilant fricative.
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- Summary by Intellect · source: Voiced dental fricative
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