efficaciousness Copy link Outline 1. vis, vim, vi, f.2. virtus, ūtis, f. • efficaciousness ; efficacy 1. vis, vim, vi, f.: to perceive the e. of certain herbs, (herbarum) vim et effectum videre, Cic.: v. influence, force. 2. virtus, ūtis, f.: e. of (magic) plants, herbarum v., Ov. Phr.: to have greater, less e., plus, minus valere, Hor.: v. effectual.
EFFICACY Copy link • EFFICACYvis (power; or circumlocution with valere): virtus (medicinal property of herbs, etc.): efficacitas: efficientia (☞ efficacia, post-classical, in the elder Pliny). In poetry, sometimes pondera (interdum lacrimae pondera vocis habent, Ov.). Natural efficacy, naturalis efficientia or potestas.