preservative
noun uk/prɪˈzɜː.və.tɪv/ us/prɪˈzɝː.və.t̬ɪv/
[ C or U ]（木材的）防腐剂，保护剂
a substance used to prevent decay in wood
a timber/wood preservative 木材防护剂
The fence has been treated with preservative. 围栏经过了防腐处理。
[ C ]（食品）防腐剂，保鲜剂
a chemical used to stop food from decaying
This bread is completely free from artificial preservatives. 这种面包绝不含人工防腐剂。
No added preservatives. 未添加任何防腐剂。
natural preservatives 天然防腐剂