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| a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F |
| to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs |
ferrite
a ceramic-like material with magnetic properties that are useful in many types of electronic devices. Ferrites are hard, brittle, iron-containing, and generally gray or black and are polycrystalline-i.e., made up of a large number of small crystals. They are composed of iron oxide and one or more other metals in chemical combination.
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