Dictionary

poison oak

noun

: a common bush in the western U.S. that causes a very itchy and painful rash on your skin if you touch it

Full Definition of POISON OAK

1
:  any of several plants related to poison ivy and producing an oil with similar irritating properties: as
a :  a bushy plant (Toxicodendron diversilobum syn. Rhus diversiloba) of the Pacific coast
b :  a bushy plant (Toxicodendron toxicarium syn. Rhus toxicodendron) chiefly of the southeastern U.S.
2
:  poison ivy 1a

First Known Use of POISON OAK

1743

poison oak

noun \-ˈōk\   (Medical Dictionary)

Medical Definition of POISON OAK

1
:  any of several plants included in the genus Rhus or sometimes in the genus Toxicodendron that produce an irritating oil like that of poison ivy: a :  a bushy plant (R. diversiloba synonym T. diversilobum) of the Pacific coast b :  a bushy plant (R. toxicodendron synonym T. pubescens) of the southeastern United States
2
:  poison ivy 1a
3
:  a skin rash produced by poison oak

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April 27, 2015
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