graptolites
基本解释
(graptolite 的复数) n.[古生]笔石( 古元脊椎动物, 现存化石 )
英文释义
plural of graptolite
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.
词形变化
上一个单词：graptolite
下一个单词：Graptolithina