The Collaborative International Dictionary of English v.0.48:

Angulate \An"gu*late\, Angulated \An"gu*la`ted\, a. [L.
   angulatus, p. p. of angulare to make angular.]
   Having angles or corners; angled; as, angulate leaves.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Angulate \An"gu*late\, v. t.
   To make angular.
   [1913 Webster]

WordNet (r) 3.0 (2006):

angulate
    adj 1: having angles or an angular shape [syn: angular,
           angulate] [ant: rounded]
    v 1: make or become angular