thick ‧ en ‧ er /ˈθɪkənə, ˈθɪknə $ -ər/ BrE AmE ( also thick‧en‧ing /ˈθɪkənɪŋ,ˈθɪknɪŋ/) noun [uncountable and countable]
[ Word Family: noun : ↑ thick , ↑ thickness , ↑ thickener , thickening, ↑ thicko ; verb : ↑ thicken ; adverb : ↑ thickly ; adjective : ↑ thick ]
a substance used to thicken a liquid