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Old form of Since. [Obs. or Prov.Eng. & Scot.] Sin that his lord was twenty year of age. Chaucer.

Of or pertaining to Mount Sinai; given or made at Mount Sinai; as, the Sinaitic law. Sinaitic manuscript, a fourth century Greek manuscript of the part Bible, discovered at Mount Sinai (the greater part of it in 1859) by Tisschendorf, a German Biblical critic; -- called also Codex Sinaiticus.

A glucoside found in the seeds of white mustard (Brassica alba, formerly Sinapis alba), and extracted as a white crystalline substance.

A bitter white crystalline nitrogenous substance, obtained indirectly from oil of mustard and ammonia; -- called also allyl melamine.

A salt of sinapic acid.

Of or pertaining to sinapine; specifically, designating an acid (C11H12O5) related to gallic acid, and obtained by the decomposition of sinapine, as a white crystalline substance.

ith sulphocyanic acid, as a white crystalline substance, having a hot, bitter taste. When sinapine is isolated it is unstable and undergoes decomposition.

A disused generic name for mustard; -- now called Brassica.

A substance extracted from mustard seed and probably identical with sinalbin. [Obs.]

A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.

Of or pertaining to mustard oil; specifically, designating an acid of the oleic acid series said to occur in mistard oil.

A nitrogenous base, CO.(NH.C3H5)2, related to urea, extracted from mustard oil, and also produced artifically, as a white crystalline substance; -- called also diallyl urea.

Choline. [Written also sinkaline.]

From a definite past time until now; as, he went a month ago, and I have not seen him since. We since become the slaves to one man's lust. B. Jonson.

Pure; unmixed; unadulterated. There is no sincere acid in any animal juice. Arbuthnot. A joy which never was sincere till now. Dryden.

In a sincere manner. Specifically:

Same as Sincerity. Beau & Fl.

The quality or state of being sincere; honesty of mind or intention; freedom from simulation, hypocrisy, disguise, or false pretense; sincereness. I protest, in the sincerity of love. Shak. Sincerity is a duty no less plain than important. Knox.

To gird with a sinch; to tighten the sinch or girth of (a saddle); as, to sinch up a sadle. [Western U.S.]

Of or pertaining to the sinciput; being in the region of the sinciput.