. "\"The chemical reactions and pathways resulting in the breakdown of formaldehyde (methanal, H2C=O), the simplest aldehyde.\" [GOC:ai]" . . "formaldehyde catabolic process" . "formaldehyde breakdown" . "formaldehyde catabolism" . "formaldehyde degradation" . "methanal catabolic process" . "methanal catabolism" . . . .