|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
refract re·fract (rĭ-frākt')
v. re·fract·ed, re·fract·ing, re·fracts
To deflect something, especially light, from a straight path by refraction.
To determine the refraction of an eye or a lens.