Noting a diseased condition or degeneration of the inside portions (laminæ) of the hoof and sole of horses' feet following founder, in which the laminæ become replaced by a soft, crumbly material.n. A pump operated by hydraulic pressure to pump water at a higher or a lower pressure than that which operates the pump; a pressure-increaser or booster, or a pressure-reducer.n. A pump for moving or raising a liquid by the pressure of air or by carrying the liquid along with the air; an air-lift.