noun
rhinoceros
Refers to the animal; commonly written in katakana.
動物園でサイを見た。
I saw a rhinoceros at the zoo.
The Japanese word サイ is derived from the English 'rhinoceros' or possibly from the Latin 'rhinoceros', adapted into katakana. The kanji 犀 is a Chinese character for rhinoceros, but its use is rare in modern Japanese.