† pycnastern. [ < pycno-comb. form + ancient Greek ἀστήρastern.] ZoologyObsoleterare a small, star-shaped sponge spicule with thick, blunt-ended rays.
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1888 W. J. Sollas in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXV. p. lxivPycnaster, a minute aster with short conical strongylate actines. This..might be regarded as a variety of the chiaster.