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：hepta-, hept-

【来源及含义】Greek: seven; normally used as a prefix

【同源单词】hebdomad, hebdomadal, hebdomadally, heptachord, heptachromic adjective, heptad