Buttress (noun)

A projecting structure at the side of a building, designed to support or reinforce the wall.

Origin:

From old french butoir 'support, prop', from late latin buttutum, variant of latin buticula 'little support', diminutive of butis 'cudgel, support'.

Examples:

1. The Gothic cathedral was supported by numerous flying buttresses.
2. The old bridge had been reinforced with buttresses to withstand the forces of the river.
3. The mason carefully carved the stone for the new buttress.
4. The city's old walls were fortified with massive buttresses.
5. The buttresses of the ancient temple were adorned with intricate carvings.