词根词缀：acantho-, acanth-, -acanth, -acanths, -acanthid, -acanthous

【来源及含义】Greek: used either as a prefix or as a suffix; pointed appendages; spine, spiny; thorn, thorny

【同源单词】acanth, acantha, acanthaceous, acanthamebiasis, acanthamoeba, acanthesthesia

词根词缀：palaeo-, palae-, paleo-, pale-

【来源及含义】Greek: original, ancient, primitive, old

【同源单词】ichthyopaleontology, palaeacanthocephala, palae-ethnology, palaeoclimatology, palaeoichnology, palaeontology