Correct spelling for the English word "Vessicnon" is [vˈɛsɪknən], [vˈɛsɪknən], [v_ˈɛ_s_ɪ_k_n_ə_n] (IPA phonetic alphabet).
"Vessicnon" is not a recognized word in the English language. It does not have any dictionary definition or meaning. It appears to be a made-up or misspelled term. It is possible that you meant to type a different word, or perhaps "vessicnon" is a neologism or a term from another language or field that is not widely known.
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A soft swelling on a horse's leg; wind-gall.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.