naiad(redirected from Hydriad)
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naiad(nā′əd, -ăd′, nī′-)
n. pl. nai·ades (-ə-dēz′) or nai·ads
The aquatic nymph of certain insects, such as a mayfly, damselfly, or dragonfly.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
naiadthe aquatic nymphal stage of dragonflies and mayflies.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005