Trochoid

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Trochoid \Tro"choid\, n. [Gr. ? a wheel + -oid; cf. F.
     trocho["i]de. See {Troche}.] (Geom.)
     The curve described by any point in a wheel rolling on a
     line; a cycloid; a roulette; in general, the curve described
     by any point fixedly connected with a moving curve while the
     moving curve rolls without slipping on a second fixed curve,


     the curves all being in one plane. Cycloids, epicycloids,
     hypocycloids, cardioids, etc., are all trochoids.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Trochoid \Tro"choid\, a.
     1. (Anat.) Admitting of rotation on an axis; -- sometimes
        applied to a pivot joint like that between the atlas and
        axis in the vertebral column.
        [1913 Webster]
  
     2. (Zool.) Top-shaped; having a flat base and conical spire;
        -- said of certain shells.
        [1913 Webster]
  
     3. (Zool.) Of or pertaining to the genus Trochus or family
        {Trochidae}.
        [1913 Webster]