- The fourth largest asteroid, having a diameter of about 430 km (267 mi). See more at asteroid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Examples from the Web for hygiea
Hygiea, the goddess of health, is represented in works of art as a virgin dressed in a long robe and feeding a serpent from a cup.Voltaire's Romances