hemithorax
noun
hemi·tho·rax
| \ -ˈthō(ə)r-ˌaks, -ˈthȯ(ə)r-
\
\
plural hemithoraxes
or hemithoraces\ -ˈthōr-ə-ˌsēz, -ˈthȯr-
\
\
Medical Definition of hemithorax
: a lateral half of the thorax