efficax
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Whitaker's Words:
efficax ADJ 3 1 NOM S X POS efficax ADJ 3 1 VOC S X POS efficax ADJ 3 1 ACC S N POS efficax, efficacis (gen.), efficacior -or -us, efficacissimus -a -um ADJ [XXXDX] lesser effective, capable of filling some function; (person/medicine); legally valid;