hexad

基本解释

It's very difficult! but I think it should be "hexad", and "hex" left when we take away the last two letters.
一个什么样的五个字母的词，当你拿掉两个字母后还有六个剩下？
The results indicated that the protoxylem of Cajanmus cajan in the main root was mostly tetrarched, less pentarched and hexad.
结果表明：木豆主根的初生木质部多为4原型，少数3原型；
The results indicated that the protoxylem of Cajanmus cajan in the main root was mostly tetrarched,less pentarched and hexad.
结果表明:木豆主根的初生木质部多为4原型,少数3原型;
HEXAD PNEUMATIC BULLET HEADS SHAPING MACHINE
六模子弹头定型机
A Pneumatic Walking-robot with Hexad Legs and Its PLC Control
采用气压驱动的六足行走机器人及PLC控制