betamethasone
noun
be·ta·meth·a·sone
| \ -ˈmeth-ə-ˌzōn
, -ˌsōn
\
, -ˌsōn
\
Medical Definition of betamethasone
: a potent glucocorticoid C22H29FO5 that is isomeric with dexamethasone and has potent anti-inflammatory activity