assamar

from The Century Dictionary.

• noun A bitter substance produced by roasting in the air such substances as sugar, meat, bread, grain, etc., until they turn brown. Baron von Reichenbach.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) The peculiar bitter substance, soft or liquid, and of a yellow color, produced when meat, bread, gum, sugar, starch, and the like, are roasted till they turn brown.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry, obsolete The soft, bitter, yellow substance produced when meat, bread, gum, sugar, starch, etc. are roasted till they turn brown.