white cedar

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Either of two North American evergreen trees (Thuja occidentalis or Chamaecyparis thyoides) having light-colored wood.

Wiktionary

1. n. The Atlantic white cypress.
2. n. An evergreen coniferous tree of the Cupressaceae family, native to the northeastern US and southeastern Canada.
3. n. The chinaberry.

GNU Webster's 1913

1. adj. (Bot.) an evergreen tree of North America (Thuja occidentalis), also the related Cupressus thyoides, or Chamæcyparis sphæroidea, a slender evergreen conifer which grows in the so-called cedar swamps of the Northern and Atlantic States. Both are much valued for their durable timber. In California the name is given to the Libocedrus decurrens, the timber of which is also useful, though often subject to dry rot. Goodale. The white cedar of Demerara, Guiana, etc., is a lofty tree (Icica altissima syn. Bursera altissima) whose fragrant wood is used for canoes and cabinetwork, as it is not attacked by insect.

WordNet 3.0

1. n. small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets
2. n. slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae