nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various Mediterranean and western Asian annual herbs of the genus Nigella, having finely dissected leaves, showy white, blue, or yellow solitary flowers, and an aggregate fruit composed of several follicles. Also called nigella.