Machicolade

The efforts of the besieging force were concentrated against a space of about two hundred and fifty yards, containing two curtains, and two towers, one of which was the square barbican, the other had a pointed roof that was built to overlap, resting on a stone machicolade, and by this means a row of dangerous crenelets between the roof and the masonry grinned down at the nearer assailants [...].

Source: wiktionary

He staggered to the battlements and leant against them and was sick unto death. [...] Pressing his hot brow against the cool granite of the machicolade there came an overpowering desire for sleep [...]

Source: wiktionary

The crenelets, which grinned between the roof and the machicolade at the top of Outfangthef, were cleared of all obstructions.

Source: wiktionary

So high was the roof on which we stood that only one of the towers or cupolas rose much above us. [...] 'There is some one who isn't much troubled by sub-lunary affairs,' I said, pointing over the machicolade.

Source: wiktionary