noun \-ˈkäl-ˌid\

Definition of HYDROCOLLOID

: any of several substances that yield gels with water (as alginic acid salts, agar, carrageenan, and related polysaccharide gums) and that are used especially as protective colloids and as impression materials in dentistry
hy·dro·col·loi·dal \-kə-ˈlid-əl, -kä-\ adjective

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