Simple past tense and past participle of crust.(verb)
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Use "crusted" in a sentence
"Their pizza was said to be crispy and very thin-crusted, which is how we like it."
"A particularly severe, highly contagious form called crusted, or Norwegian, scabies can affect the elderly, AIDS patients and people on immunosuppressants."
"(minute acari) in the scarfskin, which occasion much irritation, and of which the itch furnishes a well-marked example; papular eruptions, or dry pimples; pustular eruptions, or mattery pimples, of which some forms are popularly known as crusted tetters; scaly eruptions, or dry tetters; and vesicular eruptions, or watery pimples."