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invention


[in-VEN-shun]

An invention is something that is thought up or created. Alexis created an invention—a new type of hairbrush.

  invention

spines


[spynes]

A spine is a hard structure with a sharp end. Cat tongues have many small spines. They are made of the same material as your fingernails.

  spines

3-D printer


[three dee PRIHN-tur]

A machine that makes an object from a drawing. The printer shoots out plastic instead of ink. The object is built layer by layer. Alexis made a brush on a 3-D printer.

  3-D printer
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