Any of various terrestrial annelid worms of the class Oligochaeta, especially those of the family Lumbricidae, that burrow into and help aerate and enrich soil.

• 蚯蚓任一种土中生活的环节虫类，属于寡毛纲，尤指正蚓属的动物，它的挖穴动土有助于疏松和肥沃土壤