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Webster 1913 Edition

Adj.

Abounding with willows; containing willows; covered or overgrown with willows.

“Willowed meads.”

Collins.

Adj.

Abounding with willows.

willowed ‎(comparative more willowed, superlative most willowed)

Abounding in willow trees.
(Can we find and add a quotation of Collins to this entry?)