Content provided by the US Census bureau for the years 2010, 2011, 2012, 2013, 20140and 2015.
Synteny. The presence of two or more genetic loci on the same chromosome. Extensions of this original definition refer to the similarity in content and organization between chromosomes, of different species for example.
Syndactyly, or webbed feet, means that the toes fuse together, either by way of bone or soft tissues which are involved in different ways. As such, this condition can be regarded as simple if the toes are united only by skin and fibrous tissue, and complex if the union entails the bones being linked together as well.