UN'DULATE, UN'DULATED, adjective Wavy; waved obtusely up and down, near the margin, as a leaf or corol. UN'DULATE, verb transitive [Latin undula, a little wave; unda, a wave; Low Latin undulo.] To move back and forth, or up and down, as waves; to cause to vibrate. Breath vocalized, that is, vibrated and undulated - UN'DULATE, verb intransitive To vibrate; to move back and forth; to wave; as undulating air.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI