oo
UK[uː]US[uː]
n
A Hawaiian honeycreeper (bird) of the genus Moho, characterized by black plumage and yellow feather tufts, now extinct.
n
The fifteenth letter of the Greek alphabet (Ο, ο), corresponding to the Roman 'o'.
Etymology
The word 'oo' represents two distinct linguistic journeys converging on the same spelling. For the bird, it is a loanword from Hawaiian ʻōʻō, an onomatopoeic name imitating the bird's call. This follows a common pattern where animal names are derived from the sounds they make. For the Greek letter, it originates from the Phoenician letter ʿayin, meaning "eye," which was adapted by the Greeks as omicron (ὂ μικρόν, "small o"). The simplified English name 'oo' is a modern clipping of this longer form. Both paths demonstrate how simple, often repetitive sounds in source languages become lexicalized into English as compact, two-letter words.
Analysis
This word is a simplex. It is a direct borrowing from Hawaiian (ʻōʻō) for the bird name, and a direct borrowing from the name of the Greek letter (ὂ μικρόν, "small o").
Examples
The last known Kauaʻi ʻōʻō was heard calling for a mate in 1987.
Omicron, often shortened to 'oo' in informal contexts, is the 15th letter of the Greek alphabet.
The vibrant yellow leg feathers of the oo were used in traditional Hawaiian ceremonial garments.