Of, relating to, or resembling glair; having the consistency or appearance of egg white.
From glair plus the adjective-forming suffix -eous (as in 'gorgeous'). This formal, somewhat technical term is used in historical and scientific contexts. It follows standard English derivational patterns for creating descriptive adjectives from nouns.
Medieval recipes describe ingredients as 'glaireous' when they had that slimy, glossy quality of egg white—it's a weird but perfect descriptor that hasn't changed in 500 years.
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