stipule (n.)youdaoicibaDictYouDict[stipule 词源字典]
"small appendage at the base of the petiole of a leaf," 1793, from French stipule, from Latin stipula "stalk (of hay), straw," from PIE *stip-ola-, from root *steip- "to stick, compress" (see stiff (adj.)).[stipule etymology, stipule origin, 英语词源]