ratproof
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ratproof — adjective Resistant to damage caused by rats … Wiktionary
rat|proof — «RAT PROOF», adjective, verb. –adj. so made that rats cannot enter. –v.t. to make ratproof: »The modern farmsteading is ratproofed, to deny food to rats; the modern town warehouse is ratproofed, to deny water to rats (Sunday Times) … Useful english dictionary