Sinus vs Facet - What's the difference?

In anatomy terms the difference between sinus and facet

is that sinus is a pouch or cavity in any organ or tissue, especially the paranasal sinus while facet is a smooth circumscribed surface.

to cut a facet into a gemstone.

(wikipedia sinus) (sinuses)

(anatomy) A pouch or cavity in any organ or tissue, especially the paranasal sinus.

A notch or depression between two lobes or teeth in the margin of an organ.

(pathology) An abnormal cavity or passage such as a fistula, caused by the destruction of tissue.

A bay of the sea; a recess in the shore.

* sinusitis * ethmoid sinus * frontal sinus * maxillary sinus * sphenoid sinus * paranasal sinus

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(wikipedia facet)

(en noun)

Any one of the flat surfaces cut into a gem.

This facet of the diamond was masterfully cut to enhance its value.

One among many similar or related, yet still distinct things.

The child's learning disability was only one facet of the problems contributing to his delinquency.

One of a series of things, such as steps in a project.

We had just about completed the research facet of the project when the order came to cancel it .

(anatomy) One member of a compound eye, as found in insects and crustaceans.

(anatomy) A smooth circumscribed surface.

the articular facet of a bone

(architecture) The narrow plane surface between flutings of a column.

(mathematics) A face of codimension 1 of a polytope.

* multifaceted

To cut a facet into a gemstone.

* Faceting and faceted are more common in the US. Facetting and facetted are more common in the UK.