armless：无臂的；无武装的；(动植物)无防护器官的  

词根词缀： -arm-武器 + -less形容词词尾,否定

• expenditure
• expense
• expensive
• experience
• experienced
• experiment
• experimental
• experimentally
• experimentation
• expert
• expertise
• expiate
• expiration
• expire
• expiry
• explain
• explanation
• expletive
• explicable
• explicate
• explication
• explicit
• explode
• exploit
• exploitation