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Low class consonant · letter 24 of 44

ธ tho thong

ธ (tho thong) is a low-class consonant named after ธง, “flag”. At the start of a syllable it is /tʰ/, written th in RTGS; at the end of one it is /t̚/ (t).

See it in 61 fontsAll 44 consonants
ธธ ธงtho thong · flag
Thai name
ธ ธง · tho thong
Name word
ธง, flag
Class
Low class
At the start of a syllable
/tʰ/ · RTGS th
At the end of a syllable
/t̚/ · RTGS t
Unicode
U+0E18 · THAI CHARACTER THO THONG
In HTML
ธ or ธ
Kedmanee key
Shift + T
Pattachote key
Shift + S

How it sounds

Another low-class th. It is found mostly in words that came into Thai from Pali and Sanskrit.

5 other letters have the same sound at the start of a syllable: ฐ tho than (high), ฑ tho montho (low), ฒ tho phuthao (low), ถ tho thung (high), ท tho thahan (low).

Easy to mistake for ร ro ruea: compare them at a large size in the grid below.

Class and tone

With no mark, a low-class letter gives the mid tone in a live syllable; in a dead one the tone is high when the vowel is short and falling when it is long. Mai ek gives falling and mai tho high.

Syllables with ธ and the vowel า
SpellingSyllableTone
No mark, live syllable (long vowel)ธาMid
No mark, dead syllable, short vowelธะHigh
No mark, dead syllable, long vowelธากFalling
Mai ekธ่าFalling
Mai thoธ้าHigh
Mai tri–not used with this class
Mai chattawa–not used with this class

The syllables show the rule, not words to learn. The tone rules explain live and dead syllables.

Words with ธ

ThaiRTGSMeaning
ธนาคารthanakhanbank
ธรรมชาติthammachatnature
ธุรกิจthurakitbusiness
พุธphutWednesday

RTGS shows neither tone nor vowel length; type a word into the font tester to see it in every font.

ธ in every font

The letter in each of the 61 families you can download here, in its regular style. Looped faces start the stroke from a small circle; loopless ones leave it out. Each card opens the family’s page.