undula

Thus, electric fields were bal - anced by electrons, light waves by photons, sound waves by phonons, and even gravitational fields were balanced by would-be duals which are hopefully called gravitons; conversely, and most importantly, all ele - mentary particles of matter were balanced by undula - tory counterparts, the so-called de Broglie waves.

Dictionary of the History of Ideas SALOMON BOCHNER 1968

Later on, however, as the phenomena of polarization, diffraction and interference of light forced upon his theory OUT OF MY LATER YEARS more and more unnatural modifications, Huyghens 'undula - tory theory of light, prevailed.

Out Of My Later Years Einstein, Albert, 1879-1955 1950

In the course of a week or more, dependent on the period of the year, there is, not inevitably, but as a rule, a rapid accession of spiral forms, such as _Spirillum volutans_, _S. undula_, and similar forms, often accompanied by _Bacterium lineola_; and the whole interspersed still with inconceivable multitudes of _B. termo_.

Scientific American Supplement, No. 643, April 28, 1888 Various

Possibly it is a true spirillum, portions of which appear in the comma shape, much as in other spirilla -- _e. g_., spirilla undula, which do not always form complete spirals, but consist only of more or less curved rods.

Scientific American Supplement, No. 458, October 11, 1884 Various

Progressive motion is not necessary to undula - tion.

Outlines of Natural Philosophy: Being Heads of Lectures Delivered in the ... 1812

Between the Cuesta Blanca and the main ridge, there is a broad valley watered by the three branches of the Arroyo Payabo, and dotted by little hills, mere undula - tions of the surface.

Transactions of the American Philosophical Society 1771