Definition of "mato" []

• A hard, round seed of any one of several leguminous plants, used by children for playing marbles; especially, a seed of Guilandina Crista, G. major, Ormosia monosperma, or Stizolobium urens, or one of the plants itself. They are usually distinguished from each other, as mato azul, mato amarillo, etc. (noun)
• A game of marbles played with these seeds. (noun)

The Century Dictionary (Public Domain)

• "In fact, the proposal to get the peace process going was an Acholi reconciliation process known as mato oput, proposed by the area leaders."
• "Others connect both en anoi'xei tou sto'mato's and en parrhesi'aj3 with gnori'sai, ` to make known with the opening of the mouth, with boldness the mystery, '&c."
• "The word lo'gos itself has at times the metonymical sense here given to it, and therefore en anoi'xei tou sto'mato's is most naturally taken without emphasis as equivalent to, when I open my mouth, i.e. when called upon to speak."