| oregon | (n) a state in northwestern United States on the Pacific, Syn. OR, Beaver State |
| oregon ash | (n) timber tree of western North America yielding hard light wood; closely related to the red ash, Syn. Fraxinus latifolia, Fraxinus oregona |
| oregon cedar | (n) large timber tree of western North America with trunk diameter to 12 feet and height to 200 feet, Syn. Lawson's cypress, Lawson's cedar, Port Orford cedar, Chamaecyparis lawsoniana |
| oregon crab apple | (n) small tree or shrub of western United States having white blossoms and tiny yellow or red fruit, Syn. Malus fusca |
| oregon grape | (n) small shrub with grey-green leaves and yellow flowers followed by glaucous blue berries, Syn. Mahonia nervosa |
| oregon grape | (n) ornamental evergreen shrub of Pacific coast of North America having dark green pinnate leaves and racemes of yellow flowers followed by blue-black berries, Syn. holly-leaves barberry, hollygrape, Mahonia aquifolium, mountain grape, Oregon holly grape |
| oregonian | (n) a native or resident of Oregon, Syn. Beaver |
| oregon maple | (n) maple of western North America having large 5-lobed leaves orange in autumn, Syn. Acer macrophyllum, big-leaf maple |
| oregon white oak | (n) small deciduous tree of western North America with crooked branches and pale grey bark, Syn. Quercus garryana, Oregon oak, Garry oak |
