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The Collaborative International Dictionary
Plasmon butter

Plasmon butter \Plasmon butter\, and resembles clotted cream in appearance. [Webster 1913 Suppl.] Plasson \Plas"son\, n. [NL., fr. Gr. ? to form.] (Biol.) The albuminous material composing the body of a cytode.

Note: It is considered simpler than protoplasm of an ordinary cell in that it has not undergone differentiation into the inner cell nucleus and the outer cell substance.
--Haeckel.