Related Clues:

• Med. specialty
• Delivery person?
• 'The Lord of the Rings' creature
• Tolkien forest giant
• Prefix with logical
• See 20-Across
• Medical prefix
• Prefix with biology
• Transmitter starter
• Hit the road
• Tolkien creature
• Prefix with modulator
• Suffix with differ
• Prefix with science
• Prefix with transmitter