Splay

For the type of search tree, see Splay tree.

For Japanese band, see Splay (Japanese band).

Splay is a physiological term that refers to the difference between urine threshold (the amount of a substance required in the kidneys before it appears in the urine) and saturation, or T_M; in this instance, saturation refers to an exhausted supply of renal reabsorption carriers. In simpler terms, splay is the concentration difference between a substance's maximum renal reabsorption vs. appearance in the urine. Splay is usually used in reference to glucose; other substances, such as phosphate, have virtually no splay at all.

Splay is also a term used with injection molded plastics: off-colored streaking that occurs when moisture is caught in the material feed, or if the material degrades during processing. If cold material impacts the surface from filling at a high rate of speed, jetting may appear, which looks very similar to splay.