| staid | (adjective) characterized by dignity and propriety | Synonyms: sedate |
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| staidly | (adverb) in a grave and sober manner | Synonyms: gravely, soberly |
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| staidness | (noun) a trait of dignified seriousness | Synonyms: sedateness, solemness, solemnity |
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| stain | (noun) an act that brings discredit to the person who does it | Synonyms: blot, smear, smirch, spot |
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| (noun) a soiled or discolored appearance | Synonyms: discoloration, discolouration |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stigma |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, soil |
| (noun) (microscopy) a dye or other coloring material that is used in microscopy to make structures visible | - |
| (verb) produce or leave stains | - |
| (verb) color with a liquid dye or tint | - |
| (verb) color for microscopic study | Synonyms: dye |
| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, maculate, sully, tarnish |
| stainability | (noun) (cytology) the capacity of cells or cell parts to stain specifically with certain dyes | - |
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| stainable | (adjective) capable of being stained (especially of cells and cell parts) | - |
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| stained | (adjective) marked or dyed or discolored with foreign matter | - |
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| (adjective) having a coating of stain or varnish | Synonyms: varnished |
| stainer | (noun) a worker who stains (wood or fabric) | - |
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| staining | (noun) (histology) the use of a dye to color specimens for microscopic study | - |
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| (noun) the act of spotting or staining something | Synonyms: maculation, spotting |
| stainless | (adjective) (of reputation) free from blemishes | Synonyms: unstained, unsullied, untainted, untarnished |
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| (noun) steel containing chromium that makes it resistant to corrosion | Synonyms: chromium steel, stainless steel |
| stair | (noun) support consisting of a place to rest the foot while ascending or descending a stairway | Synonyms: step |
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| staircase | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: stairway |
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| stairhead | (noun) platform at the top of a staircase | - |
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| stairs | (noun) a flight of stairs or a flight of steps | Synonyms: steps |
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| stairway | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: staircase |
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| stairwell | (noun) a vertical well around which there is a stairway | - |
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