Made of glass or resembling glass; composed primarily of glass or having glass-like qualities.
From 'glass' + '-en' (Old English/Germanic adjectival suffix meaning 'made of'). This ancient suffix appears in words like 'golden', 'wooden', and 'wooden'.
The '-en' suffix is ancient Germanic—it's how people originally showed what something was made of, and 'glassen' shows that glass was important enough to merit this formal adjective form centuries ago!
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