The Collaborative International Dictionary of English v.0.48:
Impearl \Im*pearl"\, v. t. [imp. & p. p. Impearled; p. pr. &
vb. n. Impearling.] [Pref. im- in + pearl: cf. F.
1. To form into pearls, or into that which resembles pearls.
Dewdrops which the sun
Impearls on every leaf and every flower. --Milton.
2. To decorate as with pearls or with anything resembling
With morning dews impearled. --Mrs.
The dews of the morning impearl every thorn. --R.