A taxonomic rank in biology below a family (科) that groups together several genera; a subfamily.
この植物はラン科の亜科に分類されている。
This plant is classified in a subfamily of the orchid family.
分類学では、科の下に亜科、属、種の順で分類されることが多い。
In taxonomy, a family is often divided into subfamilies, genera, and species in that order.