שָׂעַר (b. h.; cmp. סָעַר II) to be rough, denom. שֵׂעָר; to shudder, fear. Sifré Deut. 318 (expl. שערום, Deut. XXXII, 17) שלא עמדה שערת וכ׳ your fathers’ hair did not stand on end before them (v. שָׁעַר II); Yalk. ib. 545.
Hif. - הִשְׂעִיר (denom. of שֵׂעָר) to grow hair, be hairy. Ḥull. 44ᵃ עד מקום שיַשְׂעִיר Ms. M. a Rashi (ed. כדי, corr. acc.) to the place (of the stomach) where it becomes covered with hair. Ib. (Chald. diction) תורא דמַשְׂעִיר טפי an ox, which is more hairy (on the stomach). Nidd. 25ᵇ עד שישעיר until the embryo has hair.