
1) Air cavity in the skull 2) Air-filled skull cavity 3) Anatomical cavity 4) Antrum 5) Bend or curve 6) Breathing passage 7) Cavity 8) Cavity; hollow 9) Cold place 10) Common blockage locale 11) Congested area 12) Congested area, sometimes 13) Congested cavity 14) Congested cavity, often 15) Congested place, at times
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https://www.crosswordclues.com/clue/sinus

1) Concavity 2) Iter 3) Recess
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https://www.crosswordclues.com/clue/sinus

Latin, meaning: curve, fold, bend / pocket, lap / bay, gulf / inner feeling, secret heart.
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http://archives.nd.edu/sss.htm

a notch or depression between two lobes or teeth in the margin of an organ.
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http://en.wikipedia.org/wiki/Glossary_of_botanical_terms

a pocket or cavity between 2 lobes
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http://orchidfetish.com/glossary.html

• (n.) An opening; a hollow; a bending. • (n.) A depression between adjoining lobes. • (n.) A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice. • (pl. ) of Sinus • (n.) A dilated vessel or canal. • (n.) A cavity; a depression. • (n.) A bay of the sea; a recess in ...
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http://thinkexist.com/dictionary/meaning/sinus/

Indentation between lobes on a leaf.
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http://www.arborday.org/trees/treeguide/glossary.cfm

in anatomy, a hollow, cavity, recess, or pocket; a large channel containing blood; a suppurating tract; or a cavity within a bone. Two types of ... [7 related articles]
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http://www.britannica.com/eb/a-z/s/101

A cavity, space, or channel in the body. Examples include hollow spaces in the bones at the front of the skull, and channels for blood and lymph. Sinuses may also be found in the heart, brain, and other organs.
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http://www.cancer.gov/dictionary?expand=S

a curved out hollow space in side the skull which is lined by respiratory epithelium and drains into the back of the throat. For example, maxillary s., ethmoid, s., sphenoids.
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http://www.encyclo.co.uk/local/20169

<anatomy> A notch, depression or cavity on the surface of an organ. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973

(si´nәs) a recess, cavity, or channel, such as one in bone or a dilated channel for venous blood. an abnormal channel or fistula, permitting escape of pus. paranasal sinus.
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http://www.encyclo.co.uk/local/21001
Si'nus noun ;
plural Latin
Sinus , English
Sinuses . [ Latin , a bent surface, a curve, the folds or bosom of a garment, etc., a bay. Confer
Sine ,
noun ]
1. An opening; a hollow; a bending.
2. A bay of the sea; a recess in the shor...
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http://www.encyclo.co.uk/webster/S/108

Any bodily cavity or hollow space.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

(si;nus) A cavity or hollow space within a body organ, such as a bone.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

Latin term that describes topographical features of the moon that resemble bays.
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http://www.moonconnection.com/moon-glossary.phtml

a pocket or cavity between 2 lobes
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http://www.orchidspecies.com/glossary.htm

A sinus is an air-filled space in the diploe of a skull bone.
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http://www.probertencyclopaedia.com/browse/ES.HTM

A bay.
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http://www.solarviews.com/eng/terms.htm

sinus 1. An air-filled cavity in a dense portion of a skull bone. The sinuses are formed in four right-left pairs: The frontal sinuses are positioned behind the forehead, while the maxillary sinuses are behind the cheeks. The sphenoid and ethmoid sinuses are deeper in the skull behind the eyes and maxillary sinuses. The sinuses are lined by mucou...
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http://www.wordinfo.info/words/index/info/view_unit/1965/2

Indentation between lobes on a leaf.
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https://www.arborday.org/trees/treeguide/glossary.cfm

a cavity within bone or a channel that contains blood; also refers to an abnormal tract in the body
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https://www.encyclo.co.uk/local/20875

Latin = a hollow or space which may contain air, venous or arterial blood, lymph or serous fluid; adjective, sinusoid.
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https://www.encyclo.co.uk/local/21450

a recess between two lobes.
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https://www.encyclo.co.uk/local/22455
(paranasal sinuses) air cavities within the facial bones, lined by mucous membranes similar to those in other parts of the airways.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---allergy-as
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