propadeutic             preliminary; introductory to some subject.
adumbrate               to give a shadow of, sketch; to foreshadow; to
                        overshadow, conceal, or darken.
cinereous               ashen; resembling ashes; turned to ashes.
                        also, |cineritious|.
decussate               to intersect at right angles; adj. crossed;
                        (bot.) occurring in opposed pairs along the
                        stem, each at right angles to the next.  [< L
                        /de~cussis/ the number ten]
enchiridion             a handbook or manual.
glacis                  a slight slope.