Pi (?), n. [See Pica, Pie magpie, service-book.] (Print.) A mass of type confusedly mixed or unsorted. [Written also pie.]
[1913 Webster]

Pi, v. t. [imp. & p. p. Pied (?); p. pr. & vb. n. Pieing (?).] (Print.) To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form. [Written also pie.]
[1913 Webster]