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Webster 1913 Edition

Adj.

Rising and falling like waves; resembling wave form or motion; undulatory; rolling; wavy;

as, an

undulating

medium;

undulating

ground

–

Un′du-laˊting-ly

adv.

ppr.

Waving; vibrating.

a. Wary; rising and falling.

undulating ‎(comparative more undulating, superlative most undulating)

wavy

Forming a series of regular curves

undulating