sinus
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sinus
- /ˈsaɪ.nəs/
Rhymes with -aɪnəs
Where it comes from
Learned borrowing from Latin sinus (“a bent surface, curve, hollow”). Doublet of sine.
noun sinuses
- A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
- An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
- Relating to or denoting the sinoatrial node of the heart or its function of regulating the heartbeat.
- An abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
- A rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
- A bay of the sea; a recess in the shore.
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Synonym of sine.
So, in the helicopteron, as the helix is at the same time a sustaining plane, it should be likened to a surface moving horizontally, and in which, consequenty, the resistance to motion will be to the lifting power as the sinus is to the cosinus of the angle formed by such plane with the horizon.
Similar: sine
Thesaurus
Closest in meaning: venous sinus, fistula, cavity, sine, hollow, recess, fossa, alveolus, antrum, depression, lacuna, pocket, crypt, concavity, groove, passage
Translations
Every language
noun venous or lymphatic cavity
| 中文 | 竇 /窦 dòu |
|---|
noun pouch or cavity in a bone or other tissue
| Español | cavidad/alvéolo/alveolo sinusal |
|---|---|
| 日本語 | 副鼻腔 fukubikō |
| 中文 | 竇 /窦 dòu |
| Português | seio |
| Français | sinus |
| Deutsch | Sinus, (paranasal) Nasennebenhöhle |
| Italiano | seno |
| Română | sinus |
| Русский | па́зуха pázuxa |
| العربية | جَيْب اَلْأُنْف jayb al-ʔunf |
noun relating to the sinoatrial node
| 中文 | 竇性 /窦性 dòuxìng |
|---|
Talk about this word "sinus." Wiktionary, via Micwyn, micwyn.com/word/sinus. Accessed 6 Nov. 2026. sinus. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/sinus "sinus." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/sinus.Cite this
@misc{sinus_2026,
title = {sinus},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/sinus},
urldate = {2026-11-06}
}
