The Collaborative International Dictionary of English v.0.48:

Phasmid \Phas"mid\, n. [See Phasm. Probably so called from its
   mimicking, or appearing like, inanimate objects.] (Zool.)
   Any orthopterous insect of the family Phasmid[ae], as a
   leaf insect or a stick insect.
   [1913 Webster]

WordNet (r) 3.0 (2006):

phasmid
    n 1: large cylindrical or flattened mostly tropical insects with
         long strong legs that feed on plants; walking sticks and
         leaf insects [syn: phasmid, phasmid insect]