Definition from Wiktionary, the free dictionary
redwood (plural redwoods)
- (countable, uncountable) the USDA-preferred term for the species Sequoia sempervirens.
- (countable) any of the evergreen conifers belonging to the genus Sequoia in the wide sense.
- (uncountable) the wood of the species Sequoia sempervirens.
- This planter is made of redwood.
- (uncountable, UK, obsolete) the wood of the species Pinus sylvestris
Derived terms 
the species Sequoia sempervirens
redwood (not comparable)