1 a leguminous plant, Arachis hypogaea, bearing pods that ripen underground and contain seeds used as food and yielding oil.
2 the seed of this plant.
3 (in pl.) colloq. a paltry or trivial thing or amount, esp. of money.
Phrases and idioms:
peanut butter a paste of ground roasted peanuts.
Useful english dictionary. 2012.