Definitions
from The Century Dictionary.
- noun A genus of acarids founded by Müller in 1781, at present restricted to those fresh-water mites in which the third joint of the palpi is the longest, the beak is as long as the palpi, and the mandibles have sharp blades.
- noun A genus of water-beetles, of the family Dytiscidœ, containing such as the European H. tarda.
Etymologies
Sorry, no etymologies found.
Support

Help support Wordnik (and make this page ad-free) by adopting the word hydrachna.
Examples
Sorry, no example sentences found.
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.