Benzene derivatives having
para positions (or
meta) bridged by a chain (commonly 10 to 12 atoms long) (Latin
ansa, handle). By extension, any arene bridged by a chain constrained to lie over one
of the two faces of the arene.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1318