Annulation (derived from annular, occasionally annelation) in organic chemistry is a chemical reaction in which a new ring is constructed on another molecule (often another ring). Examples are the Robinson annulation, Danheiser annulation and certain cycloadditions. Annular molecules are constructe...
Found op http://en.wikipedia.org/wiki/Annulation
A series of transverse depressions on the cuticle of a nematode.
Found op http://www.encyclo.co.uk/visitor-contributions.php
A transformation involving fusion of a new ring to a molecule via two new bonds. Some authors use the term 'annelation' for the fusion of an additional ring to an already existing one, and 'annulation' for the formation of a ring from one or several acyclic precursors, but this distinction is not ma...
Found op http://www.chem.qmul.ac.uk/iupac/gtpoc/A.html
An`nu·la'tion noun A circular or ringlike formation; a ring or belt. Nicholson.
Found op http://www.encyclo.co.uk/webster/A/88
• (n.) A circular or ringlike formation; a ring or belt.
Found op http://thinkexist.com/dictionary/meaning/annulation/
(from the article `segmentation`) ...the particular metamerism within each group clearly demonstrates the derivative relationship of its members. In Acanthocephala and some members of ...
Found op http://www.britannica.com/eb/a-z/a/78
a ring-like, often pigmented cortical zone, usually more or less blackened, especially of branches of Neuropogon.
Found op http://www.anbg.gov.au/glossary/webpubl/lichglos.htm
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