spheno-youdaoicibaDictYouDict[spheno- 词源字典]
before vowels sphen-, word-forming element meaning "wedge," from comb. form of Greek sphen "a wedge," probably cognate with Old Norse spann "splinter," Old English spon "chip of wood" (see spoon (n.)).[spheno- etymology, spheno- origin, 英语词源]