ceasnaich

examine, catechise, Irish ceasnuighim; from Latin quæstio, quæstionis, English question. Stokes (Bk.of Lis.) has suggested that the Latin and Gadelic are cognate; though possible (qais, qis may become by umlaut ces in Gaelic), it is improbable from the stem form in n persisting in the Gaelic verb.