The Collaborative International Dictionary
Quinary system
Quinary \Qui"na*ry\, a. [L. quinarius, from quini five each,
akin to quinque five: cf. F. quinaire. See Five.]
Consisting of five; arranged by fives.
--Boyle.
Quinary system (Zo["o]l.), a fanciful classification based on the hypothesis that each group contains five types.