Affected by or having fever; feverish or showing signs of fever.
From 'fever' plus '-ous' (suffix meaning full of or characterized by). The '-ous' suffix comes from Latin '-osus' and is extremely common in English for creating adjectives from nouns, as in 'dangerous,' 'famous,' and 'nervous'.
The '-ous' suffix is one of the most Latinate features of English vocabulary—it's how we distinguish between everyday and formal versions of similar concepts. 'Feverous' sounds more technical or literary than 'feverish,' showing how suffix choice affects register and tone.
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