词根词缀:gon-, gonio-, -gon, -gonal, -gonally, -gony
【来源及含义】Greek: corner, bend, angle
【同源单词】agonic, decagon, diagon, diagonal, dodecagon, enneagon
词根词缀:nona-, noni-, non-
【来源及含义】Latin: nine
【同源单词】Nona, nonagenarian, nonagenarianism, nonagesimal, nonagon, nonan