Metagenomics vs. Genomics

Metagenomics and Genomics Definitions
Metagenomics
(used with a sing. verb) The study of the structure and function of nucleotide sequences isolated directly from an environmental sample, especially of a community of microorganisms.
Genomics
The study of all of the nucleotide sequences, including structural genes, regulatory sequences, and noncoding DNA segments, in the chromosomes of an organism.
Metagenomics
(genetics) The study of genomes recovered from environmental samples; especially the differentiation of genomes from multiple organisms or individuals, either in a symbiotic relationship, or at a crime scene.
Genomics
(genetics) The study of the complete genome of an organism
Genomics
The branch of genetics that studies organisms in terms of their genomes (their full DNA sequences)