efficious

== English == === Etymology === Possibly a variation of efficacious or derivative of efficacy influenced by analysis of the final -c- in the later word as being part of a suffix -cy rather than the word-stem. === Adjective === efficious (comparative more efficious, superlative most efficious) (rare, nonstandard) Efficacious. 1899, The Carolina Medical Journal, volumes 43-44, page 207, quoting the Medical Standard: This remedy will be found speedily efficious in hoarseness due to excessive action of the vocal cords or resulting from an acute cold.