词根：spin = thorn, 表示“刺”

spine n. 刺；勇气；脊椎

spiny a. 多刺的；困难重重的

porcupine n. 豪猪（porc猪+upine[=spine刺]→有刺的猪→豪猪）

词根词缀：spin-, spino-, spini-

【来源及含义】Latin: thorn, prickle; by extension, "backbone", the spinal cord

【同源单词】anospinal, anterospinal, cerebrospinal, cervicispinal, costispinal, dorsispinal