SAPWOOD

A section of a Yew branch showing 27 annual growth rings, pale sapwood and dark heartwood, and pith (centre dark spot). The dark radial lines are small knots.

:''For the NATO reporting name for the R-7 Semyorka intercontinental ballistic missile, see SS-6 Sapwood.''
'Sapwood' is the outer layer of wood in a tree, next to the bark. See also wood#Heartwood and sapwood.

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