ceathardha
Definitions (by source)
adj. four~cornered (epithet of cruinne) 2710.
Duanaire Mhéig Uidhir: The poembook of Cú Chonnacht Mág Uidhir, Lord of Fermanagh 1566-1589. Editor: David Greene. Translator: David Greene.
adjective. Four-cornered.