a gray-black, water-insoluble powder, Ni 2 O 3 , which, at 600°C, decomposes to nickel oxide: used chiefly in storage batteries as an oxidizing agent.
a common weed, Solanum nigrum, of the nightshade family, having poisonous leaves, white flowers, and black edible berries. noun a poisonous solanaceous plant, Solanum nigrum, a common weed in cultivated land, having small white flowers with backward-curved petals and black berry-like fruits
any of several oak trees, as Quercus velutina, characterized by a blackish bark. the hard, durable wood of such a tree, used for making furniture, floors, etc. Historical Examples The Sick-a-Bed Lady Eleanor Hallowell Abbott Everyday Adventures Samuel Scoville Si Klegg, Book 2 (of 6) John McElroy The Sick-a-Bed Lady Eleanor Hallowell Abbott The Story […]
a tropical American tree, Bucida buceras, having leathery leaves and greenish-yellow flowers.
Often, black ops. a secret mission or campaign carried out by a military, governmental, or other organization, typically one in which the organization conceals or denies its involvement: Some national intelligence agencies use black ops to undermine enemy governments. The company even resorted to an industrial black op to steal secrets from its competitor.