Extremely lofty evergreen of southern end of western foothills of Sierra Nevada in California; largest living organism; SYN. big tree, Sierra redwood, Sequoiadendron giganteum, Sequoia gigantea, Sequoia Wellingtonia.
An evergreen tree (Sequoiadendron giganteum) of the bald cypress family that grows on the western slopes of the Sierra Nevada mountain range and sometimes exceeds 270 feet (about 82 meters) in height — called also big tree, sequoia.