| STAVE | Piece of the side of a barrel |
| STAVES | Sides of a barrel |
| BLOOD | It's the red liquid inside of us that comes from the heart (You might see a drop of it seeping out of the side of a vampire's mouth) |
| APOTHEM | In geometry, the perpendicular from the centre to the midpoint of any one of the sides of a regular |
| GUNWALE | The top of the side of a boat or the topmost plank (7) |
| TORIC | A lens geometrically shaped like a slice out of the side of a donut |
| FACE | Dial of a watch or clock; or, each one of the sides of a polyhedron (4) |
| EARHOLE | Feature of the side of a football helmet |
| GUNNELS | The tops of the sides of the ship |
| FOURHUNDRED | Length of one of the sides of the right triangle |
| LEG | One of the sides of a triangle other than the base or hypotenuse |
| TAILS | One of the sides of a coin |
| HYPOTENUSE | One of the sides of a right-angled triangle (10) |
| LAG | Word for a stave of a barrel; a lath or strip; a wooden lining; a covering for a boiler/pipe; a delay; or, a convict (3) |
| CYLINDER | Shape of a barrel, column or the crown of a top hat; piston chamber; roller in a printing press; or, a tank in a domestic hot-water system (8) |
| SINE | In a right-angled triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse (4) |
| FIRKIN | From "fourth", word for a quarter of a barrel originally, later nine gallons of ale or beer; 56lb of butter; a small cask/keg for the latter, or for cheese, eels, herrings, lard, soap or wine (6) |
| COTANGENT | In a right-angled triangle, the length of the side adjacent to an angle divided by that of the side opposite it (9) |
| LEES | Sediment left at the bottom of a barrel of wine |
| HOOP | Iron band securing a stave of a barrel; or, a croquet arch (4) |
