from the GNU version of the Collaborative International Dictionary of English
- n. A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See crawfish.
from The Century Dictionary and Cyclopedia
- n. The typical genus of the family Astacidæ, and one of the two leading genera of fluviatile crawfishes, the other being Cambarus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. type genus of the family Astacidae; Old World crayfish
Sorry, no etymologies found.
Among his Malacostraca he compares point by point the external parts of the carabus (_Palinurus_), and the astacus (_Homarus_), and he compares also the general internal anatomy of the various "genera" he distinguishes.