Anatropal

( Bot. ) An ovule which is turned down upon itself, so that the foramen, or true apex, points to the base, and the chalaza is at the apex. Anchor Ice. Ice which forms at the bottom of streams or lakes; also ice below the surface of water. The former sometimes lifts anchors with it when it rises; the latter often clogs water wheels, pipes, . It is formed when the bottom of a body of water is below the freezing point; and also when the whole body of water is below this point, though wind keeps ice from forming on the surface, while it is free to form below. At other times ice is formed by eddies below the surface, or small ma es of snow form nuclei for the formation of ice in water of low temperature.