ellipsoidal

Under low magnetic fields, the Fermi surface appeared to be three-dimensional and roughly ellipsoidal.

From Science Daily ● Sep. 5, 2026

This is also sometimes called an ellipsoidal joint.

From Textbooks ● Jun. 9, 2022

Under the electron microscope, SARS-CoV-2 virions look spherical or ellipsoidal.

From Scientific American ● Jun. 25, 2020

The ellipsoidal shape, roughly 15 feet across and suspended from the ceiling, is composed of 230 chrome-plated aluminum rods poking out from a mirrored sphere, about a third of them tipped with electric lights.

From Los Angeles Times ● Oct. 19, 2018

This gigantic ellipsoidal block of rock, which seems as though balanced on a sharp point, could neither be displaced nor made to oscillate by continued leaping.

From Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume I (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy. by Karl Ritter von Scherzer