A very tall, coniferous evergreen tree (Sequoiadendron giganteum) native to the high western slopes of the Sierra Nevada in California and having a massive trunk and light-colored, reddish wood. Also called big tree, giant redwood, wellingtonia.
(plural giant sequoias)
- The species Sequoiadendron giganteum.
- An individual tree belonging to this species, especially a large and mature one.