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smalto =
Colored glass or other pieces
of vitreous materials, esp. in
minute regular squares, used in
mosaic work.
spandrel =
An area, roughly triangular in
shape, included between the
extradoses of two adjoining
arches and a line approxi-
mately connecting their crowns
(or a space approximately
equal to half in case of a single
arch); often ornamented with
tracery.
splayed lintel =
An horizontal lintel above
a window, each end of
which slants toward a cen-
ter line through the win-
dow; often has a keystone
at its center.
spur =
A decorative appendage of
the base of a round column
resting on a square or po-
lygonal plinth.
stepped arch =
An arch in which the voussoirs
are cut horizontally and/or ver-
tically so they fit in with the
masonry courses above and
below, forming steps.
smalto
spandrel
splayed lintel
spur
stepped arch