| STO | of the color of slate or granite |
|---|---|
| STO | totally sober |
| STO | common European chat with black plumage and a reddish-brown breast |
| STO | any Old World herb of the genus Aethionema |
| STO | any of various northern temperate plants of the genus Sedum having fleshy leaves and red or yellow or white flowers |
| STO | succulent shrubs and herbs |
| STO | someone who cuts or carves stone |
| STO | (informal) under the influence of narcotics |
| STO | any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones |
| STO | venomous tropical marine fish resembling a piece of rock |
| STO | primitive winged insect with a flattened body |
| STO | (of fruits having stones) having the stone removed |