cymatium

From Latin cȳmatium (“ogee”), from the Ancient Greek κῡμάτιον (kūmátion), the diminutive form of κῦμα (kûma, “wave”). Equivalent to Latin cȳmat(is) (“sprout, swelling, hollow sphere”) +‎ -ium, stem of cȳma, from Ancient Greek κῡ́μᾰτος (kū́mătos, “wave, billow, swell, sprout, fetus”), genitive of κῦμα (kûma).