Pronunciation of English ⟨th⟩

Sounds spelled with the digraph ⟨th⟩ In English, the digraph ⟨th⟩ usually represents either the voiced dental fricative phoneme /ð/ (as in this) or the voiceless dental fricative phoneme /θ/ (as in think). Occasionally, it stands for /t/ (as in Thailand, or Thomas). In the word eighth, it is often pronounced /tθ/. In compound words, ⟨th⟩ may be a consonant sequence rather than a digraph (as in the /t.h/ of lighthouse). General description In standard English, the phonetic realization of the two dental fricative phonemes shows less variation than many other English consonants. Both are pronounced either interdentally, with the blade of the tongue resting against the lower part of the back of the upper teeth and the tip protruding slightly, or with the tip of the tongue against the back of the upper teeth. For some speakers these two positions are in free variation, while for other speakers they are in complementary distribution, the position behind the teeth being used when the dental fricative stands in proximity to an alveolar fricative /s/ or /z/, as in myths (/θs/) or clothes (/ðz/). Lip configuration may vary depending on phonetic context. The vocal folds are a