| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| backslide | (verb) drop to a lower level, as in one's morals or standards | Synonyms: lapse |
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| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| bolide | (noun) an especially luminous meteor (sometimes exploding) | Synonyms: fireball |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| collide | (verb) crash together with violent impact | Synonyms: clash |
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| (verb) cause to collide | - |
| (verb) be incompatible; be or come into conflict | Synonyms: clash, jar |
| collider | (noun) an accelerator in which two beams of particles are forced to collide head on | - |
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| elide | (verb) leave or strike out | - |
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| euclidean | (adjective) relating to geometry as developed by Euclid | Synonyms: euclidian |
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| exaltolide | (noun) the macrocyclic lactone having fifteen carbon atoms; it has a musky scent, similar to exaltone. | - |
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| glide | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: coast, slide |
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| (noun) the activity of flying a glider | Synonyms: gliding, sailing, sailplaning, soaring |
| (noun) a vowellike sound that serves as a consonant | Synonyms: semivowel |
| (verb) move smoothly and effortlessly | - |
| (verb) fly in or as if in a glider plane | - |
| (verb) cause to move or pass silently, smoothly, or imperceptibly | - |
| glider | (noun) aircraft supported only by the dynamic action of air against its surfaces | Synonyms: sailplane |
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| halide | (noun) a salt of any halogen acid | - |
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| landslide | (noun) a slide of a large mass of dirt and rock down a mountain or cliff | Synonyms: landslip |
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| (noun) an overwhelming electoral victory | - |
| millidegree | (noun) a unit of temperature equal to one-thousandth of a degree | - |
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| mudslide | (noun) a landslide of mud | - |
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| rockslide | (noun) a landslide of rocks | - |
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| slide | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: coast, glide |
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| (noun) sloping channel through which things can descend | Synonyms: chute, slideway, sloping trough |
| (noun) a transparency mounted in a frame; viewed with a slide projector | Synonyms: lantern slide |
| (noun) a small flat rectangular piece of glass on which specimens can be mounted for microscopic study | Synonyms: microscope slide |
| (noun) plaything consisting of a sloping chute down which children can slide | Synonyms: playground slide, sliding board |
| (noun) (music) rapid sliding up or down the musical scale | Synonyms: swoop |
| (noun) (geology) the descent of a large mass of earth or rocks or snow etc. | - |
| (verb) to pass or move unobtrusively or smoothly | Synonyms: slither |
| (verb) move obliquely or sideways, usually in an uncontrolled manner | Synonyms: skid, slew, slip, slue |
| (verb) move smoothly along a surface | - |
| slider | (noun) a fastball that curves slightly away from the side from which it was thrown | - |
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| (noun) freshwater turtle of United States and South America; frequently raised commercially; some young sold as pets | Synonyms: Pseudemys scripta, yellow-bellied terrapin |
| (noun) someone who races the luge | Synonyms: luger |
| (noun) a person who slips or slides because of loss of traction | Synonyms: skidder, slipper |
| slideway | (noun) sloping channel through which things can descend | Synonyms: chute, slide, sloping trough |
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| tetrahalide | (noun) any halide containing four halogen atoms in its molecules | - |
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