词根词缀：echino-, echin-

【来源及含义】Greek: spiny, prickly; sea urchin; hedgehog; [spiny] seed husk

【同源单词】echinate, echinidium, echinite, echinochrome, echinocyte, echinoderm

词根词缀：-idium, -idion

【来源及含义】Greek: smaller or lesser; little

【同源单词】acarinarium, androgametangium, antheridium, arachnidium, ascidium, aspidium