The Collaborative International Dictionary of English v.0.48:
Stalker \Stalk"er\ (st[add]k"[~e]r), n. 1. One who stalks. [1913 Webster] 2. A kind of fishing net. [1913 Webster]WordNet (r) 3.0 (2006):
stalker n 1: someone who walks with long stiff strides 2: someone who stalks game 3: someone who prowls or sneaks about; usually with unlawful intentions [syn: prowler, sneak, stalker]