D defs.my
Entry 3 senses Webster, 1913

Convolution

/kän'-vəl-o͞oshˌ-ən/ · Con·vo·lu·tion · IPA /kˈɑnvəlˌuːʃən/
01 n. The act of rolling anything upon itself, or one thing upon another; a winding motion.
  1. 1.
    The act of rolling anything upon itself, or one thing upon another; a winding motion.
    “O'er the calm sea, in convolution swift, The feathered eddy floats.” Thomson.
  2. 2.
    The state of being rolled upon itself, or rolled or doubled together; a tortuous or sinuous winding or fold, as of something rolled or folded upon itself.
  3. 3.
    An irregular, tortuous folding of an organ or part; as, the convolutions of the intestines; the cerebral convolutions. See Brain.(Anat.) See: Brain