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.
Medical Definition of RUMEN. : the large first compartment of the stomach of a ruminant from which food is regurgitated for rumination and in which cellulose is broken down by the action of symbiotic microorganismsâcalled also paunch; compare abomasum, omasum, reticulum.efinition of RUMEN. : the large first compartment of the stomach of a ruminant in which cellulose is broken down by the action of symbiotic microorganisms â compare abomasum, omasum, reticulum. â ruÂ·miÂ·nal \-mÉ-nÉl\ adjective. See rumen defined for kids.