[Elamur Dictionary](https://md.dictionary.elamur.ai/free/en/) · [this page in HTML](https://dictionary.elamur.ai/free/en/english/efficacious/)

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# efficacious

adjective (efficacious) — formal

«efficacious» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

(formal) Working well; producing the result you want, especially of a medicine or treatment. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#m1)

### In the lessons

A formal exam and medical word. It tells the reader that something truly works. In science: scientists test whether a treatment is efficacious with fair tests. Phrases: «efficacious in», «highly efficacious», «efficacious against».

### Examples

- The new medicine proved efficacious against the cough. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x1)
- Rest and fluids are efficacious for a cold. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x2)
- The scientists tested whether the cream was efficacious. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x3)
- A warm bath was efficacious in calming the baby. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x4)
- The spray was efficacious against greenfly. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x5)
- Practice is the most efficacious way to learn tables. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/#x6)

### Note

Formal. Noun: «efficacy». Close words: «effective» (works), «efficient» (works without waste). In speech say «works well», «effective». Pronounced ef-ih-KAY-shus.

## On Mova

- [Trees and pragmatics of «efficacious» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacious/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«efficacious» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/efficacious.html) on Mova free.