Definition of the Smooth ER. The smooth endoplasmic reticulum, or smooth ER, is an organelle found in both animal cells and plant cells. An organelle is a sub-unit within a cell that has a specialized function.The main function of the smooth ER is to make cellular products like hormones and lipids.he smooth endoplasmic reticulum, or smooth ER, is an organelle found in both animal cells and plant cells. An organelle is a sub-unit within a cell that has a specialized function.
Definition of suprailium. : a cartilaginous epiphysis at the sacral end of the ilium of some animals.
Top Definition. Supratentorial. A word used by doctors and nurses to imply that a patient's problems are all in their mind. The tentorium is a membrane just under the brain, so supratentorial refers to what is above that, namely the brain. This term can be used in front of the patient or patient's family because it sounds like technical jargon.