#fused rings

• Fused — Pertaining to structures, chemical molecules, or organisms that are ring-shaped, composed of cyclic rings, or feature fused molecular rings sharing common atoms. In organic chemistry, it describes fused polycyclic hydrocarbon compounds, while in zoology it historically references ring-segmented organisms (annelids).
• Fused systems — The plural form of the word 'anelată' or, in structural chemical taxonomy, a collective designation used to specify hydrocarbon molecules containing fused ring systems. In biology, it describes the totality of ring-like structures found in specific species.
• Anthracene — A polycyclic aromatic hydrocarbon with the chemical formula C14H10, consisting of three linearly fused benzene rings, appearing as colorless or pale yellow crystals with a strong blue-violet fluorescence under ultraviolet light.