Speed ratings on tires are expressed in letters and are generally listed along with the load index for a tire after the size, for instance 245/40R18 93H. 93 is a load index and the H is the speed rating .â¦. What Does Z Mean On The Tires | Zr Speed Rated | Zr Rating. 1  Differences in Tire Speed Ratings Explained.
Effacement: Thinning of the cervix. In the last month of pregnancy the cervix will begin to stretch and thin. This is an indication that the lower portion of the uterus is getting prepared for delivery, as a thinner cervix dilates more easily. Your health care provider can check for effacement in the final two months of pregnancy.
Effacement means that the cervix stretches and gets thinner. Dilatation means that the cervix opens. As labor nears, the cervix may begin to thin or stretch (efface) and open (dilate) to prepare for the passage of the baby through the birth canal (vagina).How fast the cervix thins and opens varies from woman to woman. In some women, the cervix may start to efface and dilate slowly over a period of weeks.A first-time mother often will not dilate until active labor begins. Late in your pregnancy, your health professional may manually check (wearing sterile gloves) how much your cervix has effaced and dilated.During labor, contractions in your uterus open (dilate) your cervix and help move the baby into position to be born.ate in your pregnancy, your health professional may manually check (wearing sterile gloves) how much your cervix has effaced and dilated. During labor, contractions in your uterus open (dilate) your cervix and help move the baby into position to be born.