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a.1.Triple; treble; threefold.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
On we rode until we came to the end of the palms, when we made another turn and entered a thribble (24) avenue of cocoas, formed of four rows of cocoa trees, young and not very tall, but very beautiful, and forming a perfect and continuous gothic arch overhead, entirely impervious to the sun.