Oo

//ˈoʊ.oʊ// adj, intj, noun

adj, intj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    (Ω, ω) The Greek letter omega. obsolete

    "Then came ther downe goodly ladyes tweyne […] And seyde, the gret Alpha & Oo most souereyne […] had hem thedyr sent."

  2. 2
    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."

  3. 3
    Alternative letter-case form of oo. alt-of
Adjective
  1. 1
    Initialism of object-oriented. abbreviation, alt-of, initialism
Intj
  1. 1
    Alternative form of ooh. alt-of, alternative

Synonyms

All synonyms
hoohoomoho

Example

More examples

"For instance, the sound of -u — described in the phrase, “like -u in ‘plural’” — may well be pronounced like -oo in ‘good’ or in ‘loom’ but not like -u in ‘stutter’ or in French ‘lune.’"

Etymology

Etymology 1

Representation of a long-o sound.

Etymology 2

From Hawaiian ʻōʻō, resembling its call.

Etymology 3

See ooh.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.