Buttressed

any external prop or support built to steady a structure by opposing its outward thrusts, especially a projecting support built into or against the outside of a masonry wall.
any prop or support.
a thing shaped like a buttress, as a tree trunk with a widening base.
a bony or horny protuberance, especially on a horse’s hoof.
to support by a buttress; prop up.
to give encouragement or support to (a person, plan, etc.).
Contemporary Examples

‘The Endgame’ Is A Well Researched, Highly Critical Look at U.S. Policy in Iraq John Barry September 24, 2012
Fiscal Cliff Countdown, Day 30: Senate Meets Dada Daniel Gross December 5, 2012
Understanding John Kerry’s Logic Bernard Avishai July 21, 2013

Historical Examples

The Sixth Sense Stephen McKenna
Tristram of Blent Anthony Hope
In Search of the Castaways Jules Verne
Private Sex Advice to Women R. B. Armitage
Haviland’s Chum Bertram Mitford
Mrs. Maxon Protests Anthony Hope
The Death Shot Mayne Reid

noun
Also called pier. a construction, usually of brick or stone, built to support a wall See also flying buttress
any support or prop
something shaped like a buttress, such as a projection from a mountainside
either of the two pointed rear parts of a horse’s hoof
verb (transitive)
to support (a wall) with a buttress
to support or sustain
n.
v.