paramylum

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A carbohydrate resembling starch that is composed of glucose and forms the reserve foodstuff of certain algae.

from The Century Dictionary.

• noun A colorless granular carbohydrate, (C₆H₁₀O₅)_n, which is found in certain infusoria, as Euglena viridis. It is related to starch (whence the name), but is not acted on by diastase or turned blue by iodine.

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

• noun (Chem.) A substance resembling starch, found in the green frothy scum formed on the surface of stagnant water.

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

• noun A substance resembling starch, found in the green frothy scum formed on the surface of stagnant water.