อะซุนซิโอน  | aL soonM siH ohnM | proper noun, geographical | Asuncion, the capital city of ปารากวัย (Paraguay) |
| อะเซติก | aL saehM dtikL | loanword, English | [Thai transcription of the foreign loanword, "acetic"] |
| อะเซทิลีน | aL saehM thiH leenM | noun, English | acetylene |
| อะดรีนัล | aL dreeM nanM | adjective, loanword, English | [Thai transcription of the foreign loanword, "adrenal"] |
อะดรีนัลคอร์เทกซ์ | aL dreeM nanM khaaw[r]M thaehk[s]F | noun | adrenal cortex |
| อะตอม | aL dtaawmM | noun, formal, loanword, English | [Thai transcription of the foreign loanword, "atom"] |
| noun, loanword, English | one of the minute indivisible particles of which according to ancient materialism the universe is composed |
| noun, loanword, English | a tiny particle |
| noun, loanword, English | the smallest particle of an element that can exist either alone or in combination |
| noun, loanword, English | the atom considered as a source of vast potential energy |
| อะเธนส์ | aL thaehn[s]M | | [alternate spelling of เอเธนส์] |
| อะนิเมะ | aL niH mehH | noun, adjective, loanword, English, Japanese | [Thai transcription of the foreign loanword, "アニメ" or "anime"] anime, Japanese-style animation |
| อะพียา | aL pheeM yaaM | | [alternate spelling of อาเพีย] |
| อะมันกัม | aL manM gamM | noun | [Thai transcription of the foreign loanword, "amalgam"] |
| อะมันปุรี | aL manM bpooL reeM | proper noun | Amanpuri |
| อะเมธิสต์ | aL maehM thit[d]H | | [alternate spelling of อาเมธิสต์] |
| อะเมริเซียม | aL maehM riH siiamM | noun, loanword, English | [chemistry] Americium; Am, atomic number 95 |
 อะไร | aL raiM | adverb | [indicating a question] what |
| noun | something; anything; things; stuff |
| noun, pronoun, adverb | [อะไร ๆ] anything; something |
| อะไร ๆ | aL raiM aL raiM | noun, pronoun, adverb | anything; something |
| อะไรก็ได้ | aL raiM gawF daiF | phrase | anything will do; that option would also be fine; whatever; anything will be okay |
| อะไรก็ตาม | aL raiM gawF dtaamM | phrase | "Whatever." |
| อะไรกัน...สวาปามก๋วยเตี๋ยวเข้าไปตั้ง ๓ จานแล้ว ยังไม่อิ่มอีกหรือ! | aL raiM ganM saL waaM bpaamM guayR dtiaaoR khaoF bpaiM dtangF saamR jaanM laaeoH yangM maiF imL eekL reuuR | example sentence | "What?! You've gobbled three bowls of noodle and are still not full?!" |
| อะไรทำให้คุณมาที่นี่ | aL raiM thahmM haiF khoonM maaM theeF neeF | example sentence | "What brings you here?" |
| อะไรนะ? | aL raiM naH | interjection | "What?" "Huh?" "What did you say?" "What was that?" |
| อะไรเนี่ย | aL raiM niiaF | interjection | "What?!?" |
| อะไรเอ่ย | aL raiM eeuyL | verb | utter; mention |
| อะลุ้มอล่วย | aL looH maawM luayF | verb | to compromise; give in |
| อะลูมิเนียม | aL luuM miH niiamM | | [alternate spelling of อลูมิเนียม] |
| อะลูมิเนียมซัลเฟต | aL luuM miH niiamM sanM faehtF | noun | aluminum sulfate |
| อะลูมิเนียมสัมฤทธิ์ | aL luuM miH niiamM samR ritH | noun | aluminum bronze |
| อะลูมิเนียมออกไซด์ | aL luuM miH niiamM aawkL sai[d]M | noun | aluminum oxide, Al2O3 |
| อะวัยวะ | aL waiM waH | | [alternate spelling of อวัยวะ] |
| อะไหล่ | aL laiL | adjective | extra; spare; reserve |
| noun | spare part |
| อะฮ้า | aL haaH | interjection, colloquial | [an interjection used to express delight or exuberance] "Whee!" |
| อะแฮ่ม | aL haaemF | interjection | ahem |
| อั | aL | | [pronunciation of the Thai short vowel, -ั ] |
| อักกรา | akL graaM | proper noun, geographical | Accra, the capital city of กานา (Ghana) |
| อักขร | akL khaL raL | | [alternate spelling of อักขระ] |
| อักขรวิธี | akL khaL raL wiH theeM | noun, phrase, formal, loanword, Pali | [formal term] orthography; rules of spelling, reading and writing; [name of a book on spelling rules] |
| อักขระ | akL khaL raL | noun, formal, loanword, Pali | letter of the alphabet; consonants; ideograph; hierograph; words |
| adjective, formal, loanword, Pali | the unchangeable constant |
| proper noun, person | Akara [a Thai male given name] (alphabet, character) |
| อักขระเขมร | akL khaL raL khaL maehnR | noun | the Khmer alphabet |
| อักขรานุกรม | akL khaL raaM nooH grohmM | noun, phrase, formal, loanword, Pali | dictionary (of alphabetic order) |
| อักษร | akL saawnR | noun | [of the alphabet] letter; character; alphabet; word; sound; vowels; consonants |
| adjective, loanword, Pali | unchangeable; unalterable; immutable |
| อักษรกลาง | akL saawnR glaangM | noun | middle- or mid-class consonant |
| อักษรควบ | akL saawnR khuaapF | noun | [Thai grammar] consonant cluster; consonant combination (see Consonant Clusters) |
| อักษรควบที่ใช้อักษรนำ | akL saawnR khuaapF theeF chaiH akL saawnR nahmM | noun | [Thai grammar] 'leading consonant' consonant cluster; consonant cluster which uses a leading consonant |
| อักษรควบที่ถูกคร่อม | akL saawnR khuaapF theeF thuukL khraawmF | noun | [Thai grammar] straddled consonant cluster |
| อักษรควบแท้ | akL saawnR khuaapF thaaeH | noun | [Thai grammar] 'true' consonant cluster, one in which the second letter is 'ร', 'ล', or 'ว' (see Consonant Clusters) |
| อักษรควบไม่แท้ | akL saawnR khuaapF maiF thaaeH | noun | [Thai grammar] 'false' consonant cluster (see Consonant Clusters) |
| อักษรตัวใหญ่ | akL saawnR dtuaaM yaiL | noun | uppercase letter; capital letters |
| อักษรต่ำ | akL saawnR dtahmL | noun | low-class consonant |
| อักษรที่ใช้แทนเสียง | akL saawnR theeF chaiH thaaenM siiangR | noun, phrase | phonogram |
| อักษรนำ | akL saawnR nahmM | noun | [Thai linguistics] the leading consonant of an initial-consonant cluster (double consonant), such as silent 'ห' (หอ นำ) in the word แหน, silent 'อ' (ออ นำ) in the word อยู่ , or the leading mid- or high-class consonant in words that follow the irregular tone rule described here |
| อักษรรูมี | akL saawnR ruuM meeM | noun | Malay version of the Roman alphabet |
