the part of an annual ring of wood, characterized by large, thin-walled cells, formed during the first part of the growing season.
Also called early wood.
Compare summerwood.

1515–25; spring + wood1

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World English Dictionary
springwood (ˈsprɪŋˌwʊd)
Compare summerwood the wood that is produced by a plant in the spring and early summer and consists of large thin-walled xylem cells

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The rings are distinct and there is an abrupt transition from springwood to summerwood.
The springwood pores are large and are completely occluded with tyloses in the heartwood.
Large pores are found in the springwood and rays of wood radiate from the pith.
Summerwood is distinctly narrower, darker, and harder than springwood.
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