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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 - astigmatic - overhead projector - optometry - optical - binoculars, field glass, field glasses, field-glasses, glasses, opera glass, opera glasses, pair of glasses, spyglass - contact, contact lens, lens - diffraction grating, grating - Fresnel lens - goggles, welder's mask - laser, optical maser - lens, lense, lens system - magic lantern - mass spectrometer, spectrometer - eyeglass, monocle - cine projector, film projector, movie projector, projector - Nicol prism - pince-nez - Polaroid - projector - Rochon prism, Wollaston prism - slide projector - eyeglasses, glasses, pair of eyeglasses, pair of glasses, pair of specs, pair of spectacles, specs, spectacles - dark glasses, shades, sunglasses - close up lens, long-focal length lens, long-focus lens, long lens, narrow-angle lens, narrow lens, tele lens, telephoto, telephoto lens, zoom lens - telescope sight, telescopic sight - fisheye lens, wide-angle, wide angle lens, wide-angle lens - hyperfocal distance - optics - holography - aberration, distortion, optical aberration - chromatic aberration - diffraction - emission spectrum - fata morgana - optical illusion - optical phenomenon - pleochroism - polarisation, polarization - spherical aberration - transparence, transparency - color spectrum, visible spectrum - parallax[Domaine]
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