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

Type of: sinus, venous sinus

• unsurpassed
• unsurprised
• unsurprising
• unsusceptibility
• unsusceptible
• unsuspected
• unsuspecting
• unsuspectingly
• unsuspicious
• unsustainable
• unswayed
• unsweet
• unsweetened
• unswept
• unswerving
• unswervingly
• unsworn
• unsyllabic
• unsyllabled
• unsymbolic
• unsymmetric
• unsymmetrical
• unsymmetrically
• unsympathetic
• unsympathetically