Word of the Day: Efficacious

Katie used a variation of this word last night during her appearance on Larry King Live.
efficacious (ef-i-key-shuh s) adjective. Capable of having the desired result or effect; effective as a means, measure, remedy, etc.
Origin: 1520–30; from the Latin,efficāci-(s. of efficāx) effectual.
efficaciously, adverb
efficaciousness, noun

Katie told Larry that Parkinson's drugs don't always treat the symptoms efficaciously.