From Middle English eiȝtthe, from Old English eahtoþa, from Proto-Germanic *ahtudô.

• (RP) enPR: ātth, IPA: /eɪtθ/
• (General American) enPR: ātth, āth, IPA: /eɪtθ/, /eɪθ/

eighth (not comparable)

1. The ordinal form of the number eight.

• 8th, 8^th, VIIIth; (in names of monarchs and popes) VIII

• French: huitième (before the noun); (in names of monarchs and popes) huit (after the name) (abbreviation VIII)
• German: achte
• Italian: ottavo; (in names of monarchs and popes) ottavo m, ottava f (after the name) (abbreviation VIII)
• Portuguese: oitavo
• Russian: восьмо́й
• Spanish: octavo

eighth (plural eighths)

1. The person or thing in the eighth position.
2. One of eight equal parts of a whole.
3. (slang) An eighth of an ounce, or approximately 3.5 grams, of marijuana or other drugs.
   • 2000, Zadie Smith, White Teeth, London: Penguin Books, published 2001, →ISBN, page 499 ↗:

     At midday he’d found an ageing eighth of hash in a drawer, a little bundle of cellophane.

• (person or thing in the eighth position) eighth one
• (One of eight equal parts) ⅛, half-quarter, henry (for an eighth of an ounce of marijuana in the UK)
• (⅛ oz.) ochava (historical Spanish contexts)

• French: huitième
• German: Achte
• Italian: ottavo, ottava
• Portuguese: oitavo, oitava
• Russian: восьмой

• French: huitième
• German: Achtel
• Italian: ottavo
• Portuguese: oitavo
• Russian: (одна) восьмой
• Spanish: octavo

eighth (eighths, present participle eighthing; simple past and past participle eighthed)

1. to divide by eight

• German: achteln