Definition of: buttress

(but′ris) noun
1. Archit. A structure built against a wall to strengthen it.
2. Any support or prop: buttresses to faith.
3. Any formation suggesting a buttress.
4. A projecting rock or hillside.
5. A horny growth on a horse's hoof. See synonyms under PROP.
—flying buttress Archit. A rampant arch extending from a wall or pier to a supporting abutment, usually receiving the thrust of another arch on the other side of the wall, which it supports by its upper end.
—v.t.
1. Archit. To support with a buttress.
2. To prop up; sustain; fortify: buttressed by her religious convictions. [<OF bouterez, nominative sing. of bouteret <bouter push, thrust]