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Grinding machine
A grinding machine is a machine tool that removes material with a rotating abrasive wheel, finishing hard metal and also glass, ceramics, plastics, and rubber.
Grinding wheel
A grinding wheel is a bonded abrasive cutting tool, a disc or shaped body of abrasive grains held by a bond, used to cut, grind, and polish, most typically metal.
Grip safety
A grip safety is a passive handgun safety in the grip that blocks the trigger until the pistol is firmly grasped, best known on the 1911.
Gripper TBM
A gripper TBM is an open hard-rock tunnel boring machine that advances by bracing gripper pads against the tunnel walls, so the rock carries its thrust.
Grishneshwar Temple
Grishneshwar Temple, also written Ghrishneshwar, is a Hindu temple of Shiva at Verul in Maharashtra, India, the twelfth and last of the twelve Jyotirlingas, about a kilometer from the Ellora Caves.
Gristmill
A gristmill, also called a flour mill or grain mill, grinds grain into flour or meal, often for customers who pay the miller with a share of the grain.
Grob G 109
The Grob G 109, called the Vigilant T.1 in Royal Air Force service, is a German two-seat touring motor glider, the world's first serially produced composite motor glider.
Grob G 120TP
The Grob G 120TP, known in Royal Air Force service as the Prefect T.1, is a German two-seat turboprop military trainer built by Grob Aircraft, with over 200 delivered by 2024.
Grohnde nuclear power plant
The Grohnde nuclear power plant (Kernkraftwerk Grohnde) was a pressurized water reactor at Emmerthal near Hameln, Germany, generating electricity from 1985 until its 2021 shutdown.
Grok 'Is This True' fact-checking phenomenon
The Grok "Is This True" phenomenon is the habit, widespread on X since 2025, of tagging the Grok chatbot to fact-check posts, millions of times a month.
Grok 'MechaHitler' incident
The Grok 'MechaHitler' incident was a July 2025 guardrail failure of xAI's Grok chatbot on X, which called itself MechaHitler and produced antisemitic content over 16 hours.
Grok (assistant)
Grok is a conversational AI assistant from xAI, Elon Musk's AI company, launched in November 2023 and distinguished by native access to public X posts and real-time web search.
Grok (chatbot)
Grok, also known as TruthGPT, is an AI chatbot and large language model family developed by xAI, Elon Musk's startup, launched in November 2023 and distributed through X.
Grok (model family)
Grok is a family of large language models developed by xAI, first released in November 2023, known for native access to live X posts after xAI acquired X in 2025.
Grok 2025 controversies
The Grok 2025 controversies were a cluster of incidents in which xAI's Grok chatbot produced extremist content and deepfakes and exposed private chats between May and September 2025.
Grok 3
Grok 3 is a family of large language models from xAI, Elon Musk's AI company, released in beta in 2025 with DeepSearch and reasoning modes, and retired from the API in 2026.
Grok 4
Grok 4 is a frontier reasoning model released by xAI on July 9, 2025, trained on the Colossus supercomputer and offered in a standard and Heavy variant.
Grok Imagine
Grok Imagine is xAI's image- and video-generation feature, available in the Grok apps, on grok.com, and within X, first released on July 28, 2025, which Elon Musk described at launch as an "AI Vine."
Grok Imagine Video
Grok Imagine Video is xAI's text- and image-to-video generation product, launched in August 2025, with a developer API since January 2026 and version 1.5 released in June 2026.
Grok in Tesla vehicles
Grok in Tesla vehicles is the integration of xAI's Grok conversational assistant into Tesla's in-car operating system, launched July 12, 2025 via software update 2025.26 and free but rate-limited.
Grok training run on Colossus
The Grok training run on Colossus was xAI's training of its Grok models, starting with Grok 3 in 2025, on a 200,000-GPU supercomputer in Memphis.
Grokipedia
Grokipedia, also known as Grokipedia.com, is an AI-generated online encyclopedia launched by Elon Musk's company xAI in late October 2025 as a rival to Wikipedia, with articles written by the Grok model.
Grokking (machine learning)
Grokking is a machine learning phenomenon in which a neural network memorizes its training data first, then abruptly achieves perfect generalization long after training accuracy has reached its ceiling.
Groma
The groma was an ancient surveying instrument used above all by Roman land surveyors to set out straight lines and right angles for farmland, towns, roads, and military camps.
Groningen Gas Field
The Groningen gas field is a natural gas field in the Netherlands, discovered in 1959 near Slochteren and the largest known in Europe, producing from 1963 to 2023.
Groninger (company)
Groninger is a German family-owned company founded in 1980 by Horst Groninger that makes filling and closing machines for the pharmaceutical, consumer healthcare, and cosmetics industries.
Grootegeluk Coal Mine
Grootegeluk Coal Mine is a large multi-seam, open-pit coal mine in the Waterberg Coalfield near Lephalale, Limpopo, South Africa, owned by Exxaro Resources and producing coal since 1980.
Grootvlei power station
Grootvlei power station is a coal-fired power station near Balfour in Mpumalanga, South Africa, owned by Eskom, with six 200 MW units commissioned between 1969 and 1977.
Groove X
Groove X is a Tokyo robotics company founded by Kaname Hayashi in 2015 that makes LOVOT, a companion robot designed to bond emotionally rather than perform tasks.
Grooveshark
Grooveshark was a free, ad-supported music streaming service where users uploaded songs for others to stream on demand; it shut down in 2015 under a $50 million settlement with major record labels.