单词：graptolite
音标：['^ræptәlait] ；
n. [古生]笔石( 古元脊椎动物, 现存化石 )
n. One of numerous species of slender and delicate
fossils, of the genus Graptolites and allied genera, found in the
Silurian rocks. They belong to an extinct group (Graptolithina)
supposed to be hydroids.
fossils, of the genus Graptolites and allied genera, found in the
Silurian rocks. They belong to an extinct group (Graptolithina)
supposed to be hydroids.
词型变化：名词复数形式 : graptolites