Definitions for oilseedˈɔɪlˌsid
Random House Webster's College Dictionary
any of several seeds, as the castor bean, sesame, or cottonseed, from which an oil is expressed.
Origin of oilseed:
oilseed, oil-rich seed(noun)
any of several seeds that yield oil
The seed of any of several plants which are used commercially as a source of vegetable oil
The plant that yields such seed