Transgenics is defined as having genetic material, in all cells, that includes a gene or DNA sequence transferred by means of genetic engineering from a genetically unlike organism.
Transgenics is also defined as of, relating to, or being an organism whose genome has been altered by the transfer of a gene or genes from another species or breed.
Transgenics can also be defined as of, relating to, or denoting an organism that contains genetic material into which DNA from an unrelated organism has been artificially introduced.
The term transgenic animal refers to an animal in which there has been a deliberate modification of the genome. Foreign DNA is introduced into the animal which is transmitted through the germ line so that every cell, including germ cells, of the animal contains the same modified genetic material.
A chimera is an animal with cells from two or more original embryos. Chimeric embryos are formed when one or more cells are injected and integrated into another animal of the same (intra-specific) or different (inter-specific) species.
More on human–animal hybrids here.