A kidney stone occurs when substances in the urine form crystals. Kidney stones can be large or small. Large ones can damage the kidneys; small ones may be able to pass in the urine. Because crystals have sharp edges, passing even small stones can be very painful. Treatment depends on what the stones are made of.
: to say that you accept or do not deny the truth or existence of (something). : to regard or describe (someone or something) as having or deserving a particular status. : to tell or show someone that something (such as a letter or message) has been received. acÂ·knowlÂ·edged acÂ·knowlÂ·edgÂ·ing.
A recognition by the principal of the agency of another in the particular instance, or in similar instances, is evidence of the authority of the agent, so that the recognition may be either express or implied.