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comparative more basylous, superlative most basylous
(chemistry, obsolete) Pertaining to, or having the nature of, a basyle; electropositive; basic. quotations
But suppose the hydrochloric acid to be mixed with a solution of sulphate of copper (the component atoms of which are likewise undergoing a change of place), the basylous elements, hydrogen and copper, then no longer limit their change of place to the circle of atoms with which they were at first combined […]
1850, Thomas Graham, Elements of Chemistry, volume 2