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：octa-, octo-, oct-, octi-, octon-

【来源及含义】Greek > Latin: eight, eighth

【同源单词】octachord, octad, octagon, octagonal, octagynous, octahedral