1. impervious to water.
2. rendered impervious to water by some special process, as coating or treating with rubber: a waterproof hat. noun
3. Chiefly British. a raincoat or other outer coat impervious to water.
4. any of several coated or rubberized fabrics that are impervious to water. verb (used with object)
5. to make waterproof.
"people can be waterproof in baths."
"nylons can be waterproof during processes."
"jackets can be waterproof."
"people can be waterproof."
"membranes can be waterproof."
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