| อลูมิเนี่ยม | aL luuM miH niiamF | | [alternate spelling of อลูมิเนียม] |
อลูมิเนียมฟอสเฟต  | aL luuM miH niiamM faawtF faehtF | noun, proper noun, phrase, formal, loanword | aluminum phosphate AlPO4 |
| อวก | uaakL | verb, intransitive, colloquial | to vomit; retch; throw up |
| อ้วก | uaakF | | [alternate spelling of อวก] |
| อวกาศ | aL waH gaatL | noun | space; outer space |
 อวด | uaatL | verb | to boast; brag; show off; display |
| อวดดี | uaatL deeM | adjective | insolent; assertive; overconfident |
| อวดภูมิ | uaatL phuuM miH | attributive verb | [is] pretentious; showy |
| อวดโอ้ | uaatL ohF | adjective, verb, transitive, intransitive, phrase, formal | to openly boast, show off, brag or be pround of |
| อวน | uaanM | noun | seine, a large net with sinkers on one edge and floats on the other that hangs vertically in the water and is used to enclose fish when its ends are pulled together or are drawn ashore |
| อ้วน | uaanF | attributive verb | [is] fat; overweight; not thin |
| verb | [จะอ้วน] will get fat; will fatten |
| อ้วนกลม | uaanF glohmM | adjective | chubby |
| อ้วนพี | uaanF pheeM | adjective | fat and strong |
| อวนสามปาก | uaanM saamR bpaakL | noun, phrase | three seines |
| อวบ | uaapL | adjective | fat; overweight; plump |
| อวมงคล | aL waH mohngM khohnM | adjective, phrase, formal, poetic, loanword, Pali | unauspiousness; misfortune; ill omen |
| อวย | uayM | verb, transitive, formal, poetic | to give; bestow upon; grant; permit; consent to; tender; yield |
| noun | pot with handles |
| อวยพร | uayM phaawnM | verb | to bless; to invoke a blessing |
| อวยพรวันเกิด | uayM phaawnM wanM geertL | phrase | Happy Birthday |
| อวล | uaanM | attributive verb | [is] aromatic |
| อวสาน | aL waH saanR | noun, verb, formal, loanword, Pali | [of an event such as a movie, etc.] has ended; finished; completed; end |
| อวัยวะ | aL waiM waH | noun | organ; body part; member; limb |
| อวัยวะเพศ | aL waiM waH phaehtF | noun | genitals; sex organ |
| อวัยวะเพศชาย | aL waiM waH phaehtF chaayM | noun | male genitals |
| อวัยวะเพศหญิง | aL waiM waH phaehtF yingR | noun, formal | female genitals |
| อวัยวะสืบพันธุ์ | aL waiM waH seuupL phan[t]M | noun | reproductive organs; genitals |
| อวัยวะสืบพันธุ์ของชาย | aL waiM waH seuupL phan[t]M khaawngR chaayM | noun | male genitals; a man's genitals |
| อวัยวะสืบพันธุ์ของหญิง | aL waiM waH seuupL phan[t]M khaawngR yingR | noun | female genitals; a woman's genitals |
| อวัยวะหลัก | aL waiM waH lakL | noun | primary organs |
| อสงไขย | aL sohngR khaiR | adjective, formal, loanword, Pali | countless; innumerable; incalculable; myriad |
| noun, adjective, formal, loanword, Pali | [a number followed by 140 ciphers or โกฏิ 26 (10 million26)] |
| อสมมาตร | aL saL maH maat[r]F | adjective | asymmetrical |
| อสังหาริมทรัพย์ | aL sangR haaR riH mohtH rap[y]H | noun | real estate; real property |
| อสัญ | aL sanR | adjective, phrase, formal, loanword, Pali | uncenscious; without any feeling |
| อสัญญี | aL sanR yeeM | adjective | unconscious; anesthetized |
| อสุจิ | aL sooL jiL | noun | sperm; semen |
| อสุรกาย | aL soonR gaayM | noun, phrase, formal, loanword, Pali | monster; demons; spectres; phantoms; ghosts |
| อสุรกายแฟรงเก็นสไตน์ | aL soonR gaayM fraaengM genM saL dtai[n]M | noun, proper noun, loanword, English | the Frankenstein monster |
| อสูร | aL suunR | noun, formal, loanword, Pali | giant; fabulous giant; demon; beast |
| อหิงสา | aL hingR saaR | | nonviolence |
| อหิวาต์ | aL hiL waa[d]M | noun | cholera |
| อหิวาตกโรค | aL hiL waaM dtaL gaL rohkF | noun | cholera |
| ออ | aawM | | [pronunciation of the 43rd letter of the Thai alphabet] |
| อ้อ | aawF | | [alternate spelling of อ๋อ] |
| อ๋อ | aawR | interjection, colloquial | [an interjection used to express understanding, comprehension, epiphany or discovery] "Oh, that is ..." |
| ออ นำ | aawM nahmM | noun | [Thai grammar] a leading silent 'อ,' as in the following four words: อยู่ , อย่า , อย่าง , and อยาก |
| อ๋อ...นั่นดอกชบาค่ะ | aawR nanF daawkL chaH baaM khaF | example sentence | [spoken by a female] "We call that flower 'Hibiscus'." |
| อ๋อ...นั่นนกพิราบครับ | aawR nanF nohkH phiH raapF khrapH | example sentence | [spoken by a male] "This is a pigeon." |
| ออก | aawkL | noun | the exit; the way out |
| verb | [ได้ออก] <subject> has put forth |
| verb | to exit; to depart; leave; go out; remove from |
| verb | to expel; to eject; to send out |
| verb, transitive, colloquial | to hatch; bring forth; bring out; proclaim |
| adverb | out; out of |
| verb | [of money] to spend, invest, or give |
| verb, intransitive | [of blood] to bleed; [or semen] to ooze; [or sweat] to seep; [or other liquids] to drip |
| particle, formal, archaic | [an ancient prefix to an official's name (e.g. ออกหลวง )] |
| verb, transitive, colloquial | [of an idea or opinion and of medicines] to express or show |
| verb | [as an airplane] to take off |
| verb | able to; can succeed |
| verb | [จะออก] will go out |
| อ๊อก | aawkH | verb | to weld |
| noun | [การอ๊อก] welding (the activity) |
| ออกกำลัง | aawkL gahmM langM | verb | to exercise |
