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

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n. The formation of a cyst

n. The process of becoming enclosed by a cyst

n. A process which, among some of the lower forms of life, precedes reproduction by budding, fission, spore formation, etc.

n. A process by which many internal parasites, esp. in their larval states, become inclosed within a cyst in the muscles, liver, etc. See Trichina.

n. The process of becoming or the state of being encysted.

"It is common to all of the protozoa to develop forms which have great powers of resistance, this being due in some cases to encystment, in which condition a resistant membrane is formed on the outside, in others to the production of spores."

trichina