Definition
'Silicious' is essentially synonymous with 'siliceous,' meaning it describes something that contains, resembles, or is made of silica. It's that same compound found in sand, quartz, and various minerals. Think of it as the slightly older, less common cousin of 'siliceous'. The term is often used interchangeably with 'siliceous' in scientific and technical contexts. So if you hear either, know they're talking about stuff related to silica. This term is all about pointing out silica's presence.