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