(geometry) A polyform made by joining right isosceles triangles edge to edge in various arrangements.

(chemistry, of a base) polybasic

The art of multiplying or magnifying sounds.

(geometry) A solid having many summits or angular points; a polyhedron.

A polyacoustic instrument.

(chemistry) Any polybasic acid

Multiplying or magnifying sound.

plural of polyacetal

(chemistry) a polyether derived from an aldehyde or ketone and containing -O-R-O- groups in the main chain; especially polyoxymethylene derived from formaldehyde

(organic chemistry) Any of a range of cross-linked polymers of acrylamide; used to form soft gels for making contact lenses etc.