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

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v. Present participle of envelop.

adj. surrounding closely on all sides.

n. the act or process of enclosing something inside something else.

adj. surrounding and closing in on or hemming in

"The tar descended in warm and sluggish streams, trickling over my forehead, dropping from my eyelids, rolling over my cheeks, sealing my mouth, gluing my ears to my skull, identifying itself with my hair, pursuing the path indicated by my spine beneath my shirt, -- in short, enveloping me with a close-fitting armor of a glutinous and most unsavory material."

close   

ambient    encompassing    surrounding    enclosure    enclosing   

envelop   

developing