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The Collaborative International Dictionary
Micella

Micella \Mi*cel"la\, n.; pl. Micell[ae]. [NL., dim. of L. mica a morsel, grain.] (Biol.) A theoretical aggregation of molecules constituting a structural particle of protoplasm, capable of increase or diminution without change in chemical nature.

Wiktionary
micella

n. (context obsolete biology English) A supposed submicroscopic particle that formed part of a biological organism