Polycyclic
The term polycyclic comes from the Greek πολύς (polýs) "a lot", often used here in the sense of "several", and from cyclic for "ring-shaped" or "in a cycle". It is used in different meanings and contexts. Examples are:
- in the sense of "containing several rings":
- In chemistry , polycyclic describes structures, especially molecules that contain several rings, see polycycles .
- In descriptive radiology , e.g. B. in mammography, polycyclic means something like "bounded by several ring or arched structures".
- In descriptive botany , a calyx is called polycyclic if it consists of several leaf circles.
- In mathematics , more precisely in group theory, there are polycyclic groups .
- In medicine, especially in dermatology , for the description of disease pictures that lead to map-like figures with central healing.
- in the sense of several repetitions:
- In zoology , for example, insects are called polycyclic if they have offspring or lay eggs several times a year.
