The Latin word crista, which crest comes from, means "tuft or comb." An animal's crest can be feathers, fur, skin, or a comb like a rooster's. Something that resembles such a feature can also be called a crest, such as a plume on an old-fashioned helmet. The top or highest part of something is also a crest, like the crest of a hill or the crest of a wave. As a verb, crest means "to reach the top" like when you crest a mountain.

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Review this list and wave goodbye to any confusion you might have about waves. Learn about types of waves, wave properties like amplitude and frequency, and different kinds of wave motion, including reflection, refraction, and diffraction. You're sure to make waves once you master these words.

Brutus is a trusted confidant of the Roman general Julius Caesar, but when he becomes convinced that Caesar's ambitions are a threat to the republic, he plots his friend's assassination. Read the full text here.

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OSHA radiation safety signs and labels cover many topics, including warnings of X-Ray equipment, RF microwaves, radioactive materials and more. If your workplace has radiation risks, it's your responsibility to protect the people who are vulnerable. Most of these signs are available in both landscape and portrait orientations.

A crest is a showy tuft of feathers on the head of a bird. It's easy to identify a male cardinal by its bright red color and the tufted crest on its head.

Review this list and wave goodbye to any confusion you might have about waves. Learn about types of waves, wave properties like amplitude and frequency, and different kinds of wave motion, including reflection, refraction, and diffraction. You're sure to make waves once you master these words.