boyau /bwoˈyō, bwäˈyō or boiˈō/ (fortification)

A communication trench

• otherwhile
• otherwhiles
• otherwise
• otherworld
• otherworldish
• otherworldliness
• otherworldly
• otherworlds
• otic
• otiose
• otiosely
• otioseness
• otiosenesses
• otiosities
• otiosity
• otitis
• otitises
• oto-
• otocyst
• otocysts
• otolaryngology
• otolith
• otolithic
• otoliths
• otological