History of Ayutthaya - Siampedia

Rabbeted-angled Chedi	See Chedi yo mum.
Rabiang khot (Th.)	Gallery, a covered walk or corridor, open at one side, usually with a wall on the outer side and columns or arches on the inner side. Inside the gallery is enshrined a row of Buddha images. As the gallery surrounding the main monument has a square plan, so the Thais generally term it "rabiang khot" (khot iterally means "bent or crooked"; rabiang lit. "verandah"). [Ref: An outline of the History of Religious Architecture in Thailand - Sonthiwan Intralib (1991).]
Rachasi	The king of lions. [Ref: The Wheel of the Law - Alabaster Henry (1871) - Trubner & Co, London - page 306.]
Rahu	The story is, that in a former state of transmigration, the sun (Athit), the moon (Chan, or Chandra), and the Asura Kahu, were brothers. They gave alms to the priesthood, instituted by some former Buddha - the first in a golden vase, the second in a silver vase, and the third in a black pot. Their almsgiving led to their being all born as angels: the first, the angel of the sun; the second, the angel of the moon; the third, the angel Rahu. Rahu, who had been on bad terms with his brothers, and was a wicked angel, became one of the Asuras who were expelled from heaven by Indra. He continually visits the heavens for the purpose of swallowing his brothers in their palaces; and his seizures of their palaces are the cause of eclipses. The rapid motion of those palaces makes it impossible for him to hold them for any time. At great Siamese festivals, one may commonly see an enormous serpent (made of lines of lamps, ingeniously jointed together, and borne about by a number of men), representing Rahu chasing the moon. [Ref: The Wheel of the Law - Alabaster Henry (1871) - Trubner & Co, London - pages 12, 217.]
Rahula	Son of Buddha; I am unable to explain the connection between the name Rahula and the remark which, according to the text, occasioned it. There is a curious note in Burnoufs "Lotus," p. 397, respecting Rahula, but it does not much help me. He mentions that some derive the name from Rahu, the demon that causes eclipses. Benfey derives Rahu from the Sanscrit root Rah, which has the sense of " abandonment"; and perhaps this may be the root of Rahula, " the abandoned." [Ref: The Wheel of the Law - Alabaster Henry (1871) - Trubner & Co, London - pages 123, 211.]
Rai (Th.)	Traditional Thai unit of area equal to 400 square Wa or 1600 square meters, used for measuring land area.
Ratsami (Th.)	Flame finial (or some times a lotus bud) emanating from the ushnisha on the head of the Buddha representing his fiery energy or explosive spiritual power (also called Ketumala).
Redented added-angled chedi	See Chedi phoem mum.
Rotaphan	One of the seven great lakes of half-mythical Himaphan - the Buddhist fairyland and in which grow the red-blue rose and white lotuses. [Ref: The Wheel of the Law - Alabaster Henry (1871) - page 296.]
Ruanthat (Th.)	See garbhagrha.