1. (noun) an abnormal passage leading from a suppurating cavity to the body surface

• fistula

2. (noun) a wide channel containing blood; does not have the coating of an ordinary blood vessel

• venous sinus

1. (noun) an abnormal passage leading from a suppurating cavity to the body surface

• passage
• passageway

2. (noun) any of various air-filled cavities especially in the bones of the skull

• bodily cavity
• cavity
• cavum

3. (noun) a wide channel containing blood; does not have the coating of an ordinary blood vessel

• canal
• channel
• duct
• epithelial duct

1. (noun) any of various air-filled cavities especially in the bones of the skull

• ethmoid sinus
• ethmoidal sinus
• sinus ethmoidales
• frontal sinus
• maxillary sinus
• nasal sinus
• paranasal sinus
• sinus paranasales

2. (noun) a wide channel containing blood; does not have the coating of an ordinary blood vessel

• cavernous sinus
• sinus cavernosus
• coronary sinus
• sinus coronarius
• sigmoid sinus
• sinus sigmoideus
• sinus rectus
• straight sinus
• tentorial sinus
• sinus transversus
• transverse sinus

1. (noun) an abnormal passage leading from a suppurating cavity to the body surface

• fistular
• fistulate
• fistulous
• fistulous