quinquenary, a. rare.
[For quinary, after L. quinque.]
= quinary.
| 1690 Leybourn Curs. Math. 339 All Squares..are to be marked with Points..over every Binary or second Figure... Sursolids over every Quinquenary Figure. 1825 T. Thomson 1st Princ. Chem. I. 37 Nitrous acid is a quinquenary compound, composed of 1 atom sulphur and 3 atoms oxygen. |