1) Relating to a parallax 
• (a.) Alt. of Parallactical
Relating to a parallax. ... (05 Mar 2000) ... 
Type: Term Pronunciation: par′ă-lak′tik Definitions: 1. Relating to a parallax.
parallax, parallactic 1. In physics, an apparent change in the position of an object when the person looking at the object changes position. 2. In astronomy, the angle between two imaginary lines from two different observation points meeting at a star or celestial body that is used to measure its distance from the Earth.