Related Clues:

• Cellular opening?
• Prefix before brow
• Prefix meaning "one"
• It may precede sex
• Beginning for "lateral"
• Valve opening?
• Single at the beginning?
• One of six in this puzzle
• College, casually
• Mono's cousin
• Start for sex or corn
• "Bi" halved?
• Single opening?
• A third of tri-
• Place of higher education