Related Clues:

• ___ over (read carefully)
• Study, with ''over''
• Sponge opening
• Gram or glottis lead-in
• Itsy-bitsy hole
• Front of center
• Centre or gram preceder
• Center intro
• Center opening
• Sponge or face feature
• Plant opening
• Examine, with ''over''
• Prefix with ''center'' or ''cycle''
• Perspiration passage
• Duct