interosculate

Century Dictionary and Cyclopedia

1. To form a connecting-link between two or more objects; be interosculant.
2. In biology, to form a connection between two species or varieties by intermediate forms.
3. In anatomy, to form a communication between different structures, such as blood-vessels.

Wiktionary

1. v. To kiss together; to touch.
2. v. biology To have the character of, or to lie between, two distinct groups.

GNU Webster's 1913

1. v. To kiss together to touch. See osculate.
2. v. (Biol.) To have the character of, or to lie between, two distinct groups.