What does 'glatt' mean in the context of kosher?

In the context of kosher laws, "glatt" specifically refers to the smoothness of the lungs of an animal, indicating that they are free from any adhesions that would render the meat non-kosher. The term originates from the Yiddish word that means "smooth."

To qualify as glatt kosher, the animal must have been inspected to ensure that its lungs do not have any blemishes or abnormalities that would disqualify it from being considered kosher. This distinction is especially important in kosher dietary practices, as it reflects a greater degree of stringency and adherence to traditional kosher standards.

The other options do not pertain to the specific criteria for kosher status in this context, as "flexible," "large," and "clean" do not capture the defining characteristic of "glatt" as it relates to animal inspection and overall kosher certification.