Without a crust; especially describing bread or sandwiches that have had the hard outer edges removed.
From 'crust' plus '-less' (without). This compound became common in culinary contexts, especially in the early 20th century when removing crusts was considered a sign of refinement in British high tea culture.
The British upper class actually popularized 'crustless' sandwiches as finger foods for fancy tea parties—removing crusts made them look dainty, and the fashion stuck so hard that it's still a children's food tradition worldwide!
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