n. (used with a sing. or pl. verb)
A North American perennial herb (Zizia aurea) in the parsley family, having compound umbels of small yellow flowers and ternately compound leaves.
[Middle English alisaundre, probably from Medieval Latin (petroselīnum) Alexandrīnum, horse-parsley, after Alexander III.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.