Resembling, containing, or having the properties of butter; butter-like in consistency or composition.
From butyr- (butter) + -aceous suffix (meaning 'full of' or 'resembling'). The -aceous ending comes from Latin -aceus and is used to form adjectives describing substances or qualities.
The -aceous suffix is wonderfully descriptive—words like 'herbaceous' and 'butyraceous' instantly tell you something behaves like or is full of that thing, which is why these words feel so intuitive even when you've never heard them!
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