Word Study
ergonomics
CIDE DICTIONARY
ergonomics, n.
biological science applied to study the relation between workers and their environments. [WordNet 1.5]
OXFORD DICTIONARY
ergonomics, n. the study of the efficiency of persons in their working environment.
Derivative
ergonomic adj. ergonomist n.
Etymology
Gk ergon work: cf. ECONOMICS
For further exploring for "ergonomics" in Webster Dictionary Online