Phyllosoma \Phyl`lo*so"ma\ (f[i^]l`l[-o]*s[=o]"m[.a]), n. [NL. See {Phyllo-}, and {-some} body.] (Zool.) The larva of the spiny lobsters ({Palinurus} and allied genera). Its body is remarkably thin, flat, and transparent; the legs are very long. Called also {glass-crab}, and {glass-shrimp}. [1913 Webster]