Definition:Cossist

Definition
The cossist tradition was a school of abacist mathematics developed in Germany in the 15th century.

Notable cossists include Johann Faulhaber.

The word can be found in the title of Robert Recorde's 1557 work:
 * The Whetstone of Witte, whiche is the seconde parte of Arithmeteke: containing the extraction of rootes; the cossike practise, with the rule of equation; and the workes of Surde Nombers.

The word cossist originates from the Italian cosa (thing).