suborder
noun [ C ] biology specialized uk/ˈsʌbˌɔː.dər/ us/ˈsʌbˌɔːr.dɚ/
（动植物的）亚目
(used in the classification of plants and animals) a group of related plants or animals, more closely related than an order but less similar than a family
See also: order noun (BIOLOGY)