bec·lo·meth·a·sone 
(bĕk′lə-mĕthə-sōn′, -zōn′)
(bĕk′lə-mĕthə-sōn′, -zōn′)n.
A corticosteroid drug, C22H19ClO5, used in the form of its dipropionate as an inhalant to treat asthma and as a nasal spray to treat allergies.
[BE(TA) + C(H)LO(RO)- + METH(YL) + alteration of (PREDN)IS(OL)ONE.]