4-letter words containing x, r
- brux — to grind the teeth, esp unconsciously
- crux — The crux of a problem or argument is the most important or difficult part of it which affects everything else.
- grex — a numerical system for measuring the size of fibers, filaments, or yarns, based on the weight in grams of 10,000 meters of the fibrous material.
- grix — /griks/ (WPI) A meta-number, said to be an integer between 6 and 7. Used either alone or with flib or suffixes such as -ty, -teen, etc. to denote an arbitrary integer (see N). "This system will bomb if there are grixty-flib users on it."
- irix — (operating system) /ir'iks/ The main operating system used by Silicon Graphics workstations and servers. IRIX is multiprocessor and multi-threaded. It incorporates substantial functionality from UNIX System V, Release 4.1 and 4.2.
- marx — Karl (Heinrich) [kahrl hahyn-rik;; German kahrl hahyn-rikh] /kɑrl ˈhaɪn rɪk;; German kɑrl ˈhaɪn rɪx/ (Show IPA), 1818–83, German economist, philosopher, and socialist.
- oryx — a large African antelope, Oryx gazella, grayish with black markings and having long, nearly straight horns: an endangered species.
- oxer — a high fence
- prex — a president, especially of a college or university.
- prix — Edmond Louis Antoine Huot de [ed-mawn lwee ahn-twan y-oh duh] /ɛdˈmɔ̃ lwi ɑ̃ˈtwan üˈoʊ də/ (Show IPA), 1822–96, and his brother Jules Alfred Huot de [zhyl al-fred] /ʒyl alˈfrɛd/ (Show IPA) 1830–70, French art critics, novelists, and historians: collaborators until the death of Jules.
- rexx — Restructured EXtended eXecutor
- roux — a cooked mixture of butter or other fat and flour used to thicken sauces, soups, etc.
- uxor — wife (used chiefly in the legal phrase et uxor).
- vrtx — Virtual Real-Time Executive. A real-time operating system from ReadySystems for the Motorola 68000 family of microprocessors.
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