abbr 1 sacral - used esp. with a number from 1 to 5 to indicate a vertebra or segment of the spinal cord in the sacral region <the relative length of cord segments S1 to S5> 2 signa - used to introduce the signature in writing a prescription 3 smooth - used of bacterial colonies 4 subject 5 svedberg
symbol sulfur .
Published under license with Merriam-Webster, Incorporated. © 1997-2018.