This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An artificial microscopic vesicle consisting of an aqueous core enclosed in one or more phospholipid layers, used to convey vaccines, drugs, enzymes, or other substances to target cells or organs.

n. an aqueous compartment enclosed by a bimolecular phospholipid membrane; a lipid vesicle

n. an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector

"Backed by funding from the trust, they isolated the healthy version of the cystic fibrosis gene and coated it in a special fatty chemical known as a liposome."

cyst    vesicle   

liposomal