sustentaculumyoudaoicibaDictYouDict[sustentaculum 词源字典]
"A supporting part or structure; especially the sustentaculum tali; Zoology a short spine present on each tarsus of the fourth pair of legs in many orb-weaving spiders (family Araneidae)", Mid 18th cent.; earliest use found in The Gentleman's Magazine. From post-classical Latin sustentaculum nourishment, food, crutch, prop from classical Latin sustentāre + -culum.[sustentaculum etymology, sustentaculum origin, 英语词源]