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Wavelength: The distance between two crests (peaks) or two troughs (valleys) on the same wave. Denoted as λ. Visual light has a range of wavelength from red light, at about 750 nm (nanometers, considered a long wavelength), to violet light, which has a wavelength of about 380 nm (considered a short wavelength).

Image can be found at Light & Eyes: Figures.

Well: A specific type of borehole created for the specific purpose of extraction liquid material, such as water, gas, or oil.

White Dwarf: A small, very dense star that typically forms at the end of a medium sized star's solar life cycle. This is the fate of our Sun.

Whorl: In plants, a group of three or more leaves fixed at the same node.

Image can be found at Silene_stellata_page.

Wood: In plants, vascular tissue that provides support. Also known as xylem.

Woody: Resembling or containing wood.