|delə̇|tirēəs, -tēr- sometimes -ter-, esp Brit |dēl- adjective
Etymology: Greek dēlētērios, from dēleisthai to hurt; akin to Latin dolare to hew — more at condole
: hurtful , destructive , noxious , pernicious
deleterious plants
deleterious effects of excessive drinking
Synonyms: see pernicious