Answer: echinus

AnswerCrossword Clue
ECHINUSYellowstone geyser
ECHINUSSea urchin.
ECHINUSSea urchin
echinusthe circular molding, usually carved with an egg-and-dart pattern, forming part of an Ionic capital between the volutes and under the balteus
echinusa sea urchin, also ECHINOID
echinusthe uppermost member of a classical cornice or of a cornice of similar form: usually a cyma recta in classical examples