spinneret (spineret)

[ of the arachnidial glands is spun out into threads of silk. Some of the spinnerets are three-jointed. See arachnid ium. (b) One of the tubules of the labium of certain caterpillars, as silkworms, through which silk is spun out of the secretion of glands connected with the mouth parts. See sericterium. (c) One of the tubules of the anal segment of certain coleopterous larvæ, as in the first larval stage (triungulin) of some blister-beetles ( Meloidæ ), through which a little silk is spun. See cut under Sitaris. (d) A like organ of any other insect.