secadora
dryer
secar
to dry
+
-dora
machine that does
Secadora means dryer and can be understood as secar0 (to dry0) + -dora1 (machine that does1), literally meaning 'a machine that dries'.
noun
  1. dryer
    An appliance used to dry clothes
    Puse la ropa en la secadora después de lavarla. // I put the clothes in the dryer after washing them.