parduzco
grayish
pardo
brown or gray
+
-uzco
somewhat or tending to
Parduzco means grayish and can be thought of as pardo0 (brown or gray0) + -uzco1 (somewhat or tending to1), so it's something tending towards gray or brown.
adjective
- grayishHaving a grayish or brownish color, similar to that of a sparrowEl cielo tenía un tono parduzco antes de la tormenta. // The sky had a grayish tone before the storm.