cylindroidal,a.|sɪlɪnˈdrɔɪdəl| [f. as prec. + -al1.] Of the form of a cylindroid; also =prec. 1844Whewell in Todhunter Acct. W.'s Works (1876) II. 324 Cylindroidal surfaces.1849–52Todd Cycl.Anat. IV. 1521/1 The cylindroidal form which the arm acquires.