Ash-colored or having characteristics related to ash; similar to cinereous but less commonly used in modern English.
From Latin 'cinereus' (ash-colored), with the '-ous' suffix. An older or archaic variant of cinereous, appearing in older medical and botanical texts.
This older word form shows how scientific English borrows and adapts Latin roots in multiple ways—cinerous, cinereous, and cinereal all mean roughly the same thing but were used in different scientific fields.
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