One of the mysteries of the English language finally explained.
(The name of) a militant Welsh nationalist organization.
1960s; earliest use found in The Times. From Welsh meibion, plural of mab son + the name of Owain Glyndŵr, Welsh prince, known in English as Owen Glendower, who fought for Welsh independence from the English.
Meibion Glyndwr/ˌmeɪbɪən ɡlɪnˈdʊə/
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