abbaco
n.— «In marked contrast to the Jesuits, Piarists taught in the vernacular, not Latin, and over philosophical mathematics they favoured “abbaco”, or mercantile arithmetic.» —“Sins of the fathers” by Miranda France Guardian (U.K.) May 22, 2004. (source: Double-Tongued Dictionary)
Further reading
Unwrap the name of a candy bar, and you just might find a story inside. For instance, one chewy treat found in many a checkout lane is named after a family’s beloved horse. And: 50 years ago in the United States, some Latino elementary...
