n. & adj.
n. 1 each of a series of large points forming a border to lace or cloth etc. 2 a cape or collar etc. with these.
adj. (Vandyke) in the style of dress, esp. with pointed borders, common in portraits by Van Dyck. Vandyke beard a neat pointed beard. Vandyke brown a deep rich brown.
[ Sir A. Van Dyck, Anglicized Vandyke, Flem. painter d. 1641 ]