From hypo- + pneumatization. <span class="searchmatch">hypopneumatization</span> (countable and uncountable, plural <span class="searchmatch">hypopneumatizations</span>) A reduced level of pneumatization, typically...
pneumatization (countable and uncountable, plural pneumatizations) (biology) The formation of air cavities, as in bones or a sinus <span class="searchmatch">hypopneumatization</span> pneumaticity...