as·tro·nom·i·cal (ăs′trə-nŏmĭ-kəl) also as·tro·nom·ic (-nŏmĭk)
1. Of or relating to astronomy.
2. Of enormous magnitude; immense: an astronomical increase in the deficit.
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.