Word.ws English Dictionary

oo

UK/ˈəʊ.əʊ/US/ˈoʊ.oʊ/

oo noun: (Ω, ω) The Greek letter omega. Also the alternative form of ooh.

Noun (1)

oo (plural oos)

  1. (obsolete) (Ω, ω) The Greek letter omega.
    • Then came ther downe goodly ladyes tweyne […] And seyde, the gret Alpha & Oo most souereyne […] had hem thedyr sent.c. 1500, The Assembly of Gods, published 1158

Noun (2)

oo (plural oos)

  1. Any of four Hawaiian birds of the genus Moho, formerly classed with the honeyeaters and now believed to be extinct.
    • On this visit I made careful inquiries as to the success of Mr. Gay's efforts to raise the "Oo" bird on this island.1898, Liliuokalani, Hawaii's Story by Hawaii's Queen
    • Several years earlier, she had arranged to bring three pairs of the rapidly vanishing ʻōʻō bird from Hawai‘i island to Kaua‘i, hoping they would form a new colony.2012, Julia Flynn Siler, Lost Kingdom, Grove Press, page 161
    Synonyms:
    moho, hoohoo

Noun (3) capitalized: OO

OO

  1. Alternative letter-case form of oo.

Adjective capitalized: OO

OO

  1. (abbreviation, initialism) Initialism of object-oriented.

Proper noun capitalized: Oo

Oo

  1. A populated place in Sigi Regency, Central Sulawesi, Indonesia.

Also used as

oo is also the alternative form of ooh.

oo meaning in Gujarati

oo in Gujarati

ઓઓ

Synonyms of oo

Forms of oo

pluraloos

Origin of oo

Representation of a long-o sound.

From Hawaiian ʻōʻō, resembling its call.

See ooh.

Phrases with oo

Questions about oo

What does oo mean?
Oo means (Ω, ω) The Greek letter omega.
What is oo in Gujarati?
Oo in Gujarati is ઓઓ. See Oo meaning in Gujarati.
What part of speech is oo?
Oo can be a noun, an adjective or a proper noun.
How do you pronounce oo?
Oo is pronounced /ˈəʊ.əʊ/ (UK).
What is the plural of oo?
The plural of oo is oos.

Words near oo in the dictionary

  1. onz
  2. onza
  3. onzas
  4. onça
  5. Onųdaʔgegáʔ
  6. oo
  7. oo arr
  8. oo oo aa aa
  9. oo-
  10. oo-er
  11. oo-la-la

Source and license

Adapted from Wiktionary: oo (page history and authors); OO (page history and authors); Oo (page history and authors); oo (Gujarati, IndicTrans2 machine translation) (model and license). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “oo.” Word.ws, https://word.ws/oo. Based on Wiktionary, CC BY-SA 4.0.