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Webster 1913 Edition

Adj.

Impervious to the rays of the sun.

“Darksome yew, sunproof.”

Marston.

Adj.

[sun and proof.] Impervious to the rays of the sun.

sunproof ‎(comparative more sunproof, superlative most sunproof)

impervious to the rays of the sun
(Can we find and add a quotation of Marston to this entry?)