BT Git 68b(29) :וחפייה קינא בזוגיתא חיוורתא‏ : he covered the nest with transparent glass [so the bird could see its young inside!]
See the entire entry for ḥiwwār adj. white

BT Git 68b(29) :אזל אייתי שמירא לאותוביה עלויה‏ : (the bird) went (and) brought the šamir to place it upon it
See the entire entry for šāmīr, šāmīrā n.m. flint, adamant; stone-cutting worm