This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Composed of three parts; threefold; triple.

adj. Having three apartments, divisions, or floors: a triplex apartment building; a triplex cinema.

n. Something, such as an apartment building, that is triplex: We live in a triplex.

adj. Having three parts; triple or threefold.

adj. Having three floors or other divisions.

n. A building with three apartments or divisions

n. throwing motion where three balls are thrown with one hand at the same time.

adj. Having three principal operative parts or motions, so as to produce a three-fold effect.

Three-fold; triple; specifically, having three elements or working parts: used of pulleys with three sheaves, of pumps with three plungers, of steam-engines with three cylinders, etc.

n. Triple time in music.

adj. having three units or components or elements

"Now a new triplex is being constructed just across the street by West Hill Homes."

multiple   

Czechs    Ex    Lex    Rex    Tex    X    aix    annex    becks    checks   

corsaire    bifold    townhouses    dislodgement    civili    quadruplex    eademque    backspread    baud    misalignment