The Collaborative International Dictionary
Cossical
Cossic \Cos"sic\ (k?s"s?k), Cossical \Cos"sic*al\ (-s?-kal), a.
Of or relating to algebra; as, cossic numbers, or the cossic
art. [Obs.] ``Art of numbers cossical.''
--Digges (1579).
Wiktionary
cossical
a. (context obsolete English) cossic; relating to algebra