triplex

noun

• 1 (Triplex) [mass noun] British trademark toughened or laminated safety glass, used especially for car windows.

• 2North American a building divided into three self-contained residences.
• a flat on three floors.

• 3 Biochemistry a triple-stranded polynucleotide molecule.

adjective

• having three parts.
• Biochemistry consisting of three polynucleotide strands linked side by side.

verb

• (of electrical equipment or systems) be provided or fitted in triplicate so as to ensure reliability.