The Collaborative International Dictionary of English v.0.48:
Paresis \Par"e*sis\, n. [NL., from Gr. pa`resis, fr. parie`nai to let go; para` from + "ie`nai to send.] (Med.) Incomplete paralysis, affecting motion but not sensation. [1913 Webster]WordNet (r) 3.0 (2006):
paresis n 1: a slight or partial paralysis