Without grooves or furrows; smooth and unmarked by channels.
From 'groove' + the suffix '-less,' meaning without or lacking. This formation follows the standard English pattern of creating opposites by adding '-less' to nouns.
A grooveless surface like polished glass has fewer places for bacteria and microbes to hide, which is why smooth, non-porous surfaces are preferred in hospitals and clean rooms. Absence of grooves can actually be a design feature for safety!
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