Etymology
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stereo- 

before vowels stere-, word-forming element meaning "solid, firm; three-dimensional; stereophonic," from Greek stereos "solid" (from PIE root *ster- (1) "stiff").

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histo- 

medical word-forming element, from Greek histos "warp, web," literally "anything set upright," from histasthai "to stand," from PIE root *sta- "to stand, make or be firm." Taken by 19c. medical writers as the best Greek root from which to form terminology for "tissue, structural element of the animal body."

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