1. Something or someone that makes or investigates tunnels
   "He is a member of the engineers, a tunneller who worked on the construction of the London Underground"
   - tunneler [US]

Derived forms: tunnellers

• condescension
• condign
• condiment
• condition
• conditional
• conditional contract
• conditional probability
• conditional reaction
• conditional reflex
• conditional relation
• conditional response
• conditional sale
• conditionality
• conditionally
• conditioned
• conditioned avoidance
• conditioned avoidance response
• conditioned emotion
• conditioned emotional response
• conditioned reaction
• conditioned reflex
• snips
• snit
• snitch
• snitcher