thanatophoric (dwarfism) 1. Deadly; lethal; leading to death. 2. Applied to a form of dwarfism that results in death. A lethal dwarfism characterized by micromelia (condition of having disproportionately short or small limbs), bowed long bones, enlarged head, flattened vertebral bodies, and muscular hypotonia; lack of pulmonary ventilation caus... Found on http://www.wordinfo.info/words/index/info/view_unit/1645/7