An individual organism or specimen (one entity of a population or group), often used in biology.
この森には同じ種の個体が何千匹もいる。
There are thousands of individuals of the same species in this forest.
標本箱には珍しい個体が丁寧に保存されていた。
The specimen box carefully preserved a rare specimen.
実験では個体ごとの差異を記録した。
In the experiment, differences for each individual specimen were recorded.