ὀστρακόω
ὀστρᾰκ-όω,
II). make the skin hard like shell, ὀ. τὸ δέρμα Pr. 869b25 :— Pass., become covered with a hard shell, ; so of bread baked to a crust, 89 . 14.50
III). pave with concrete (cf. ὀστρακοκονία), IG 22.463.82 (iv B. C.).