1. A tube of small internal diameter; holds liquid by capillary action
   - capillary, capillary tube

Type of: tube, tubing

Part of: thermometer

• backbeat
• backbench
• backbencher
• backbend
• backbite
• backbiter
• backblast
• backblocks
• backboard
• backbone
• backbreaking
• backchat
• backcloth
• backcomb
• backcross
• backdate
• backdoor
• backdown
• backdraft
• backdraught
• backdrop
• backed
• backer
• backfield
• backfile