"High affinity" refers to a strong attraction or attachment between two things. It means that they have a strong bond or connection, usually because they fit together very well or have similar characteristics. Full definition
Many of these toxins have a particularly high affinity for becoming stored in body fat. (drjockers.com)
A particular challenge, one that could have important therapeutic applications, is to design an antibody that binds with high affinity to a target protein. (britannica.com)
According to many studies, mercury has a particularly high affinity for the molecular structure of collagen. (supernaturalacnetreatment.com)