| shoreline | (noun) a boundary line between land and water | - |
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| sibylline | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, kabbalistic, qabalistic |
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| (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibyllic, vatic, vatical |
| sideline | (noun) an auxiliary activity | Synonyms: avocation, by-line, hobby, pursuit, spare-time activity |
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| (noun) an auxiliary line of merchandise | - |
| (noun) a line that marks the side boundary of a playing field | Synonyms: out of bounds |
| (verb) remove from the center of activity or attention; place into an inferior position | - |
| skyline | (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, horizon, sensible horizon, visible horizon |
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| (noun) the outline of objects seen against the sky | - |
| slackline | (noun) a partially tensioned line for balance or walking | - |
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| snapline | (noun) a chalked string used in the building trades to make a straight line on a vertical surface | Synonyms: chalk line, snap line |
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| spline | (noun) a thin strip (wood or metal) | Synonyms: slat |
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| (noun) a flexible strip (wood or rubber) used in drawing curved lines | - |
| storyline | (noun) the plot of a book or play or film | Synonyms: plot line |
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| strapline | (noun) a secondary heading, especially one printed above another. | - |
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| streamline | (verb) contour economically or efficiently | - |
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| succinylcholine | (noun) a muscle relaxant for striated muscle that is used as an adjunct to anesthesia during certain surgical procedures | - |
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| tapeline | (noun) measuring instrument consisting of a narrow strip (cloth or metal) marked in inches or centimeters and used for measuring lengths | Synonyms: tape, tape measure |
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| tetracycline | (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections | Synonyms: Achromycin |
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| theophylline | (noun) a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator | Synonyms: Elixophyllin, Slo-Bid, Theobid |
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| timberline | (noun) line marking the upper limit of tree growth in mountains or northern latitudes | Synonyms: timber line, tree line |
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| timeline | (noun) a sequence of related events arranged in chronological order and displayed along a line (usually drawn left to right or top to bottom) | - |
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| tolazoline | (noun) vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis) | - |
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| touchline | (noun) either of the sidelines in soccer or rugby | - |
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| tourmaline | (noun) a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones | - |
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| towline | (noun) (nautical) a rope used in towing | Synonyms: towing line, towing rope, towrope |
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| tramline | (noun) the track on which trams or streetcars run | Synonyms: streetcar track, tramway |
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| trampoline | (noun) gymnastic apparatus consisting of a strong canvas sheet attached with springs to a metal frame; used for tumbling | - |
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| trotline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: setline, spiller, trawl, trawl line |
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| underline | (noun) a line drawn underneath (especially under written matter) | Synonyms: underscore |
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| (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underscore |
| (verb) draw a line or lines underneath to call attention to | Synonyms: underscore |
| undiscipline | (noun) the trait of lacking discipline | Synonyms: indiscipline |
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| valine | (noun) an essential amino acid found in proteins; important for growth in children and nitrogen balance in adults | - |
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| waistline | (noun) the narrowing of the body between the ribs and hips | Synonyms: waist |
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| waterline | (noun) a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship | Synonyms: water level, water line |
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