), in its
original meaning, is any thing raised or supported; it is applied in the
plural to walls built on strong foundations. (Hesych., Suid. s. v.)
Vitruvius uses the word to describe an instrument which, by making the
lengths of the shadows of a fixed gnomon, showed the different altitudes of
the sun at the different periods of the year. (Vitr.
Schneider.) It must not be confounded with the modern analemma, which is
more complicated and precise than the instrument described by Vitruvius.