Lewis & Short

† dĭămē̆tros, i, f., = διάμετρος,

  1. I. a diameter, Col. 5, 2, 7; Vitr. 10, 14; Macr. Somn. Scip. 1, 20 sq. al.
  2. II. Adj., central: radiatio, Firm. Math. 4, 1 med.