shelled

The word 'shelled' is a straightforward English formation built upon the ancient root for a hard covering. The core noun 'shell' descends from Proto-Germanic skaljō, meaning a division or a piece that splits off, which itself derives from the Proto-Indo-European root (s)kel-, meaning "to cut" or "to split". This etymological link reflects the concept of a shell as something that splits off from a body or encases it. The addition of the adjectival suffix '-ed', a native English morphological element, creates a participle-like adjective that directly describes the state of possessing a shell or, conversely, having had the shell taken off. Thus, the modern word logically encapsulates both the presence and the absence of the defining hard covering, depending on context.