From WordNet (r) 3.0 (2006):
patter
n 1: plausible glib talk (especially useful to a salesperson)
[syn: spiel, patter, line of gab]
2: a quick succession of light rapid sounds; "the patter of
mice"; "the patter of tiny feet"
v 1: rain gently; "It has only sprinkled, but the roads are
slick" [syn: sprinkle, spit, spatter, patter,
pitter-patter]
2: make light, rapid and repeated sounds; "gently pattering
rain" [syn: patter, pitter-patter]