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a suffix designating a compound containing a member of the aldehyde group: chloral, ethanal.
suffixes meaning 'characterized by' or 'pertaining to': appendiceal, meningeal.
-al[L. adj. suffix -al-]
1. A suffix meaning relating to, as in abdominal, intestinal.
2. In chemistry, a suffix indicating an aldehyde.
suffix meaning pertaining to.