‖n. pl. [ NL. See Imperforate. ] (Zool.) A division of Foraminifera, including those in which the shell is not porous.
{ } a. [ L. pref. im- not + perforatus, p. p. of perforate to perforate. See Perforate. ] Not perforated; having no opening or aperture. Sir J. Banks. [ 1913 Webster ]
n. [ Cf. F. imperforation. ] The state of being without perforation. [ 1913 Webster ]