D defs.my
Entry 1 sense Webster, 1913

Decuman

· Dec·u·man · IPA /ˈdɛkjʊmən/
01 a. Large; chief; -- applied to an extraordinary billow, supposed by some to be every tenth in order. [R.] Also used substantively.
  1. 1.
    Large; chief; -- applied to an extraordinary billow, supposed by some to be every tenth in order. [R.] Also used substantively.[R.]