strat·us (strătəs, strātəs)
n. pl. strat·i (strătī, strātī)
A low-altitude cloud formation consisting of a horizontal layer of gray clouds.
[From Latin strātus, past participle of sternere, to stretch, extend; see ster-2 in the Appendix of Indo-European roots.]
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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.