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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
boggle
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
English dictionary
Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
Translation
Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
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optical instrument (en) - astigmatic (en) - overhead projector (en) - optometry (en) - optical (en) - 双眼望远镜, 双筒望远镜, 觀劇鏡, 观剧镜, 雙眼望遠鏡, 雙筒望遠鏡 - 隐形眼镜片, 隱形眼鏡片 - diffraction grating, grating (en) - Fresnel lens (en) - 护目镜, 護目鏡 - 激光, 雷射 - 透鏡, 透镜 - magic lantern (en) - mass spectrometer, spectrometer (en) - 单片眼镜, 單片眼鏡 - cine projector, film projector, movie projector, projector (en) - Nicol prism (en) - pince-nez (en) - Polaroid (en) - 幻灯机(或电影放映机) - Rochon prism, Wollaston prism (en) - slide projector (en) - 眼鏡, 眼镜 - 太阳眼镜, 太阳镜, 太陽眼鏡, 太陽鏡 - 电传照相, 長焦距鏡頭, 长焦距镜头, 電傳照相, (照相机的)变焦镜头 - telescope sight, telescopic sight (en) - fisheye lens, wide-angle, wide angle lens, wide-angle lens (en) - hyperfocal distance (en) - optics (en) - holography (en) - aberration, distortion, optical aberration (en) - chromatic aberration (en) - diffraction (en) - emission spectrum (en) - fata morgana (en) - optical illusion (en) - optical phenomenon (en) - pleochroism (en) - polarisation, polarization (en) - spherical aberration (en) - transparence, transparency (en) - color spectrum, visible spectrum (en) - parallax (en)[Domaine]
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