Related Clues:

• Popular hymn, with 33 Down
• Wave down, as a taxi
• Hadrian's "hi"
• Stones from the sky
• Prayer opener
• Caesar's hail
• '__ Maria'
• Roman hello
• Fifth, for one
• Cab signal
• Hadrian's hail
• GPS display
• Gladiator's greeting
• Park, e.g., in N.Y.C.
• ''Ave!''