[ek-wuh-see-tuh
m] 
[-tuh] . | any plant of the genus Equisetum, comprising the horsetails. |
| eq·ui·se·tum (ěk'wə-sē'təm) n. pl. eq·ui·se·tums or eq·ui·se·ta (-tə) See horsetail. [Latin equisaetum, horsetail : equus, horse; see ekwo- in Indo-European roots + saeta, bristle, stiff hair.] |
| horse·tail (hôrs'tāl') n. Any of various nonflowering plants of the genus Equisetum, having a jointed hollow stem and narrow, sometimes much reduced leaves. Also called equisetum. |