1. An unpaired sinus of the dura mater
   - straight sinus, tentorial sinus

Type of: sinus, venous sinus

• unsuccessful
• unsuccessful person
• unsuccessfully
• unsufferable
• unsugared
• unsuitability
• unsuitable
• unsuitableness
• unsuitably
• unsuited
• unsullied
• unsung
• unsupervised
• unsupportable
• unsupported
• unsupportive
• unsuppressed
• unsure
• unsurmountable
• unsurpassable
• unsurpassed
• unsurprised
• unsurprising
• unsusceptibility
• unsusceptible