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plural oos
(obsolete) (Ω, ω) The Greek letter omega.
Any of four Hawaiian birds of the genus Moho, formerly classed with the honeyeaters and now believed to be extinct. quotations examples
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
Alternative form of ooh examples