English word pentafluoride comes from English fluoride, English penta- (Five.)
| Dictionary entry | Language | Definition |
|---|---|---|
| fluoride | English (eng) | (chemistry) A binary compound of fluorine and another element or radical.. (chemistry) Any salt of hydrofluoric acid; for example, potassium fluoride. |
| penta- | English (eng) | Five. |
| pentafluoride | English (eng) | (inorganic chemistry) Any fluoride containing five fluorine atoms in each molecule. |