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| ฤ | | particle, loanword, Sanskrit, abbreviation | a Sanskrit ligature (consonant and vowel combination) which can be pronounced as ริ (ฤทธิ์) or รึ (พฤกษา) or เรอ (ฤกษ์  ). The character is not normally listed in the Thai alphabet although appearing between ร and ล in Thai alphabetical order |
| particle, formal, poetic, archaic, ancient, loanword, Sanskrit, abbreviation | [a particle indicating negation] not; no [usually used in Thai poetry] |
| abbreviation | [interrogative] which? what? |
| ฤกษ์ | reerkF | noun, loanword, Sanskrit | auspicious occasion; lucky time; propitious moment |
| noun, proper noun | [ดาวฤกษ์] planet |
| ฤคเวท | reukH khaH waehtF | proper noun, loanword, Sanskrit | The Rg-Veda—one of the three ancient Hinduism writs |
| ฤชา | reuH chaaM | noun, archaic, loanword, Sanskrit | fee |
ฤชากร | reuH chaaM gaawnM | noun, archaic, loanword, Sanskrit | revenue derived from fee |
| ฤชาธรรมเนียม | reuH chaaM thamM niiamM | noun | (i.e. court) fees; (i.e. membership) dues; charges |
| ฤชุ | reuH chooH | modifier, loanword, Sanskrit | [is] straightforward; upright; honest; trustworthy |
| ฤดี | reuH deeM | noun, poetic, loanword, Sanskrit | pleasure; delight; gladness |
| proper noun, person, formal, loanword, Pali | Rudee [a Thai female given name] (pleasure, delight) |
| ฤดู | reuH duuM | noun, loanword, Sanskrit | [climate, weather] season |
| noun, loanword, Sanskrit | a period of time in commerce or agriculture |
| [sports, play or show] season |
| classifier | [numerical classifier for season] |
| ฤดูการแข่งบอลได้เวียนมาอีกหน | reuH duuM gaanM khaengL baawnM daiF wiianM maaM eekL hohnR | example sentence | "The football season has been here again!" |
| ฤดูกาล | reuH duuM gaanM | noun, loanword, Sanskrit | a season |
| ฤดูเก็บเกี่ยว | reuH duuM gepL giaaoL | noun | a harvest time or busy farming season |
| ฤดูติดสัด | reuH duuM dtitL satL | noun | animals' mating season |
| ฤดูไถหว่าน | reuH duuM thaiR waanL | noun, phrase, formal | season or time for plowing/ploughing and rice-planting |
| ฤดูทำนา | reuH duuM thamM naaM | noun | farming or rice-growing season |
| ฤดูใบไม้ผลิ | reuH duuM baiM maaiH phliL | noun | the season; spring |
| ฤดูใบไม้ร่วง | reuH duuM baiM maaiH ruaangF | noun, phrase, formal | autumn; fall (the season) |
| ฤดูฝน | reuH duuM fohnR | noun | rainy season (July - October in Thailand) |
| ฤดูร้อน | reuH duuM raawnH | noun | summer; hot season (March - June in Thailand) |
| ฤดูแล้ง | reuH duuM laaengH | noun | dry season |
| ฤดูหนาว | reuH duuM naaoR | noun | winter; cold season (November - February in Thailand) |
| ฤดูหนาว | reuH duuM naaoR | noun | winter |
| ฤทธ์ | rit[t]H | adjective, loanword, Sanskrit | prosperous; thriving; growing; rich; increasing |
| ฤทธา | ritH thaaM | noun | power; effect |
| ฤทธานุ | ritH thaaM nooH | | [alternate spelling of ฤทธา] |
| ฤทธานุภาพ | ritH thaaM nooH phaapF | noun | supernatural power |
| ฤทธิ์ | ritH | noun, adjective, loanword, Sanskrit | enormous ability or resource; formidable force; colossal power; might; supernatural or paranormal power, miraculous or magical faculty |
| noun, loanword, Sanskrit | prosperity; progress; growth |
| noun, formal, loanword, Sanskrit | [of medicines] effect |
| ฤทธิ์เดช | ritH daehtL | noun | power; might; force; power |
| ฤทธิ์อย่างอ่อน | ritH yaangL aawnL | adjective, phrase, formal | [of the effect of medicines or drugs] mild |
| ฤทธี | ritH theeM | | [alternate spelling of ฤทธิ์] |
| ฤทัย | reuH thaiM | noun, loanword, Sanskrit | mind; heart; soul; feeling |
| noun, proper noun, person, loanword, Sanskrit | Ruthai [a Thai female given name] (heart, mind) |
| ฤษี | reuH seeR | noun, loanword, Sanskrit | a hermit; anchorite; ascetic |
| noun, figurative, idiom, loanword, Sanskrit | [idiomatic usage: a person who lives alone, away from people and sociey] |
| ฤาษี | reuuM seeR | | [alternate spelling of ฤๅษี] |
| ฤๅ | reuuM | particle, formal, poetic, archaic, ancient, loanword, Sanskrit | [a particle indicating negation] not; no (usually used in Thai poetry) |
| particle, Sanskrit | [indicating a question] "?" |
| [interrogatory] what; which |
| ฤๅษี | reuuM seeR | noun, loanword, Sanskrit | ascetic; meditating recluse or hermit |
| ฤๅษีเลี้ยงเต่า | reuuM seeR liiangH dtaoL | | lit. “a hermit shepherding turtles” |
| (metaphor) a government of geriatric and unresponsive leaders |
| ฤๅษีเลี้ยงลิง | reuuM seeR liiangH lingM | phrase, idiom | [idiom] to bring up unruly children — "Like herding cats." |
| ฤๅษีเลี้ยงลิง | reuuM seeR liiangH lingM | | [literal] “a hermit shepherding monkeys” |
| ฤๅษีเลี้ยงลิง | reuuM seeR liiangH lingM | | [metaphor] a government of overachieving but uncontrollable leaders. |
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