tooth; tusk; fang
Rare standalone noun; normally appears in compounds. When used alone, it can refer to an animal's tooth or tusk, but 歯 (は) is the common word for human teeth.
The kanji 牙 often represents a large animal tooth.
Rare standalone use; almost always seen in the compound 象牙 (ぞうげ). The standalone reading げ for 'ivory' is archaic or highly literary.
See also: 象牙 (ぞうげ)
象牙の飾りが展示されている。
An ivory ornament is on display.
Ivory (ぞうげ) is a material for crafts made from tusks.
tooth of Buddha; Buddha's tooth relic
Potentilla cryptotaeniae (species of flowering plant)
The kanji 牙 is a pictograph of an animal's tusk or fang. The reading げ is the on'yomi, used primarily in compounds. The standalone use is rare and mostly literary or archaic.