duplex

1. Double; made up of two parts.
   1. not comparablearchitectureHaving two floors.
   2. not comparablearchitectureHaving two units, divisions, suites, or apartments.
   3. not comparableengineeringOf stainless steel: having a structure containing austenite and ferrite in roughly equal proportions.

      Duplex stainless steels have been classified according to the first period (1930–1960) and second period (1960–1990). The designations for these duplex alloys in the United States have been primarily according to Unified Numbering System (UNS) numbers in the S3xxx.x series.

      2010, Harold M. Cobb, The History of Stainless Steel, Materials Park, O.H.: ASM International, →ISBN, page 189

2. not comparablecommunicationsBidirectional (in two directions).

   duplex telegraphy

   Antonyms: simplex, unidirectional

3. not comparablesoil scienceHaving horizons with contrasting textures.

   Soils are duplex, sandy and solodic. The dominant trees are the stringybark eucalypts […]

   1977, Australian Journal of Botany, volume 25, page 462

plural duplexes · plural duplices

1. AustraliaCanadaUSA house made up of two dwelling units.

   The house had been renovated into a duplex and he’d put in a phone line.

   2020, Akwaeke Emezi, The Death of Vivek Oji, Faber & Faber Ltd, page 53

   Synonyms: semi-detached house

2. USA dwelling unit with two floors.
3. hobbiesA cancellation combining a numerical cancellation with a second mark showing time, date, and place of posting.
4. artsA throwing motion where two balls are thrown with one hand at the same time.
5. biochemistryA double-stranded polynucleotide.
6. geographyA system of multiple thrust faults bounded above and below by a roof thrust and floor thrust.

   In contrast, the folds in the overlying lithotectonic unit 4 are larger and are cut by a series of faults in a duplex.

   1993, David J. Lidke, Jack Burton Epstein, Chester A. Wallace, U.S. Geological Survey Bulletin, page 16

   1 more example

   It has been noted, using a combination of surface geologic and seismic reflection data, that a duplex, although formed in response to movement of a thrust sheet, frequently arches the thrust sheet as the duplex is built by duplication of rocks beneath it […]

   1995, Robert D. Hatcher, Structural Geology: Principles, Concepts, and Problems, page 211

present singular third person duplexes · participle present duplexing · participle past duplexed · past duplexed

1. To make duplex.
2. To make into a duplex.
3. artsTo make a series of duplex throws.