脊椎(せきつい)動物(どうぶつ) せきついどうぶつ noun vertebrate; vertebrate animal academicanimal-general 1. vertebrate; animal with a backbone An animal that has a backbone, or spinal column. The group includes fish, amphibians, reptiles, birds, and mammals. 魚(さかな)は脊椎(せきつい)動物(どうぶつ)だ。🔊 Fish are vertebrates. 脊椎(せきつい)動物(どうぶつ)には背骨(せぼね)がある。🔊 Vertebrates have a backbone. 鳥(とり)や哺乳類(ほにゅうるい)はすべて脊椎(せきつい)動物(どうぶつ)に分類(ぶんるい)される。🔊 Birds and mammals are all classified as vertebrates. Composed of 脊椎(せきつい) (spine, vertebrae) + 動物(どうぶつ) (animal). A biology term for animals that have an internal backbone.Related words無脊椎(むせきつい)動物(どうぶつ): invertebrate — animals without a backbone, such as insects and shellfish; the direct antonym背骨(せぼね): backbone; spine哺乳類(ほにゅうるい): mammals — one group of vertebrates Related Words Related: 背骨(せぼね) (backbone) Related: 哺乳類(ほにゅうるい) (mammals) Compare: 軟体動物(なんたいどうぶつ) (mollusk) general Added 2026.5.18 12:04 · Revised 2026.9.2 13:02 27500/27744_sekitsuidoubutsu