magnetohydrodynamics
Concise Oxford English Dictionary © 2008 Oxford University Press:
magnetohydrodynamics /magˌniːtəʊˌhʌɪdrə(ʊ)dʌɪˈnamɪks/
▶plural noun [treated as sing.] the branch of physics concerned with the behaviour of an electrically conducting fluid (such as plasma or molten metal) acted on by a magnetic field.
– derivatives
magnetohydrodynamic adjective.
magnetohydrodynamic adjective.
'magnetohydrodynamics' also found in these Oxford entries:

