脊 means “spine, backbone”

せき · seki

Also: stature, height

Kun'yomi (Japanese reading)
せ, せい
On'yomi (Chinese reading)
セキ

JLPT N1 · Taught in secondary school · 10 strokes

The story

Flesh (月) under strokes that fan out in pairs from a center line: picture ribs branching off a backbone. 脊 is the spine: 脊椎 is the spinal column, 脊髄 the spinal cord, and 脊椎動物 are the vertebrates.

Used in 脊椎 (sekitsui, spine), 脊髄 (sekizui, spinal cord), and 脊椎動物 (sekitsui doubutsu, vertebrates)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.