The daraf is the unit of electrical elastance, the voltage across a capacitor after accepting an electric charge of 1 coulomb; it is the reciprocal of the farad. Proposed by Arthur Edwin Kennelly in 1936 as a backwards spelling of farad, the term daraf is not recognized by the SI.

How do you spell toughened glass?

The phrase toughened glass is another name for tempered glass, that which has been cooled very quickly during the manufacturing process. Toughened glass has a different composition compared to standard (annealed) glass that makes it withstand daily stresses better than annealed glass does.

How do you say not repairable?

The words irreparable and unrepairable are synonyms that mean unable to be fixed. Both irreparable and unrepairable are adjectives (words that modify nouns by describing an aspect of them).