SH-M-N-H – ‘accumulation of forms’

VIII. שמנה, eight. This word springs from the double root שום and מון. By the first שום, is understood the action of placing, of putting one thing upon another; by the second מון that of specifying, of distinguishing by forms. It is therefore, the accumulation of forms that should be understood by this number. This signification is made obvious by that of the verb שמון, which means literally, to fatten, to make larger. (Hebraic Tongue Restored, Fabré d’Olivet)