(biochemistry) An enzyme, secreted by the upper intestinal mucosa, that catalyzes the activation of trypsinogen by converting it to trypsin

Without turtles.

Very important; vital or crucial.

Of or like glass, especially in being smooth and somewhat reflective. / Including a lot of glass. / Dull; expressionless. / (surfing, of water, not comparable) Lacking any chop; smooth and mostly f...