テトラ
テ
ト
ラ
Meanings
1
tetra-
Prefix meaning 'four', used in scientific and technical terms such as テトラポッド (tetrapod) or テトラコード (tetrachord).
Tetrapods are used to prevent coastal erosion.
2
tetra (fish)
Refers to small tropical freshwater fish of the family Characidae, popular in aquariums.
I keep ten neon tetras in the aquarium.