ellipsonen.
/ɛˈlɪpsəʊn/ A revolving storm following an elliptical instead of a circular path.Apparently an isolated use.
ΚΠ
1860 Adm. Fitz Roy in Mercantile Marine Mag. 7 354 The smaller cyclonic motions (ellipsones?).
This entry has not yet been fully updated (first published 1891; most recently modified version published online September 2019).
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n.1860