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swell and fall; pertaining to a propagated alternating motion, similar to that of waves. Undulatory theory, or Wave theory (of light) (Opt.), that theory which regards its various phenomena as due to undulations in an ethereal medium, propagated from the radiant with immense, but measurable, velocities, and producing…

nute particles or corpuscles. The theory is now generally rejected, and supplanted by the undulatory theory.

An apparatus for registering the shocks and undulatory motions of earthquakes.

The art of registering the shocks and undulatory movements of earthquakes.

Moving like waves; undulatory. [Obs.] Sir T. Browne.

Resembling, or in the nature of, waves; having a wavy surface; undulatory.

Rising and falling like waves; resembling wave form or motion; undulatory; rolling; wavy; as, an undulating medium; undulating ground. -- Un"du*la`ting*ly. adv.

One who advocates the undulatory theory of light. Whewell.

Consisting in, or accompanied by, undulations; undulatory.

Undulating; undulatory.

A genus of motile bacteria characterized by short, slightly sinuous filaments and an undulatory motion; also, an individual of this genus.

the phenomena of double refraction. See under Refraction. -- Wave theory. (Physics) See Undulatory theory, under Undulatory.