Scrabble Dictionary

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Yes, lithosphere is playable

...and is worth 19 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Lithosphere" Definition

noun

The outer part of the earth, consisting of the crust and upper mantle, approximately 100 km (62 mi.) thick.

Source: American Heritage Dictionary

The solid part of a celestial body (as the earth).

Source: Merriam-Webster

The outer part of the solid earth composed of rock essentially like that exposed at the surface, consisting of the crust and outermost layer of the mantle, and usually considered to be about 60 miles (100 kilometers) in thickness.

Source: Merriam-Webster

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