The Collaborative International Dictionary
Paramylum
Paramylum \Par*am"y*lum\, n. [NL., fr. Gr. para` beside + ? starch.] (Chem.) A substance resembling starch, found in the green frothy scum formed on the surface of stagnant water.
Wiktionary
paramylum
n. A substance resembling starch, found in the green frothy scum formed on the surface of stagnant water.