3) In hardware design, a prototype is a hand-built model that represents a manufactured (easily replicable) product sufficiently for designers to visualize and test the design. The word prototype comes from the Latin words proto, meaning original, and typus, meaning form or model.
In chemistry, a salt is an ionic compound which is made up of two groups of oppositely charged ions. The ion with a positive charge is called a cation, and the one with a negative charge is called an anion.
Confidence votes 7.7K. To take something with a grain of salt is American English colloquial from 1647, from Modern Latin 'cum grano salis', implying disbelief, requiring eventual conclusion.