blockade (n.) Look up blockade at Dictionary.com
mid-17c., from block- (v.) + -ade, false Fr. ending (the Fr. word is blocus, 18c. in this sense, which seems to be in part a back-formation from the verb bloquer and in part infl. by the M.Du. loan-word blokhuus "blockhouse"). The verb is recorded from c.1680.