1. astronomical(a = adj.pert) astronomic - relating or belonging to the science of astronomy; "astronomic telescope"
Derived form noun astronomy1
2. astronomical(s = adj.all) astronomic, galactic - inconceivably large;
Of or pertaining to astronomy; in accordance with the methods or principles of astronomy. [1913 Webster]
astronomical, adj. (also astronomic)
1 of or relating to astronomy.
2 extremely large; too large to contemplate.
Idiom:
astronomical unit a unit of measurement in astronomy equal to the mean distance from the centre of the earth to the centre of the sun, 1.495 x 10(11) metres or 92.9 million miles. astronomical year see YEAR n. 1.
Derivative:
astronomically adv.
Etymology:
L astronomicus f. Gk astronomikos
astronomical telescope, astronomical unit, astronomical year