牙 means “fang, tusk”

きば · kiba

Also: tusk radical (no. 92)

Kun'yomi (Japanese reading)
きば, は
On'yomi (Chinese reading)
ガ, ゲ

JLPT N1 · Taught in secondary school · 5 strokes

The story

Upper and lower teeth locking together: the Shuowen reads 牙 as a picture of the great back teeth. Now it is a fang or tusk: 象牙, elephant tusk, is ivory, and a rival's 牙城 is the stronghold they defend to the last.

Used in 牙 (kiba, fang/tusk), 象牙 (zouge, ivory), and 牙城 (gajou, stronghold)

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