thạch

Sino-Vietnamese word from 石, clipping of thạch hoa thái (石花菜) (“Gelidium amansii”), a species of red algae used to make agar. Rau câu (“Gracilaria”), a term designated another genus of red algae and agar source, came to be used in the Southern dialects, while Central dialects use đông sương.

• (Hà Nội) IPA^(key): [tʰajk̟̚˧˨ʔ]
• (Huế) IPA^(key): [tʰat̚˨˩ʔ]
• (Saigon) IPA^(key): [tʰat̚˨˩˨]
• Homophone: Thạch

thạch

1. (Northern Vietnam) agar

   Synonyms: rau câu, đông sương, xu xoa, thạch xoa

2. (by extension) isinglass
3. (Northern Vietnam) jelly (dessert)

   Synonyms: rau câu, đông sương

thạch

1. (probably obsolete) a unit of volume chiefly for measuring grains, equal to 10 litres

thạch

1. Sino-Vietnamese reading of 石

• đá