| sir | (noun) term of address for a man | - |
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| sirdar | (noun) an important person in India | - |
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| sire | (noun) male parent of an animal especially a domestic animal such as a horse | - |
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| (noun) the founder of a family | Synonyms: father, forefather |
| (noun) a title of address formerly used for a man of rank and authority | - |
| (verb) make (offspring) by reproduction | Synonyms: beget, bring forth, engender, father, generate, get, mother |
| siren | (noun) eellike aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills | - |
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| (noun) an acoustic device producing a loud often wailing sound as a signal or warning | - |
| (noun) a warning signal that is a loud wailing sound | - |
| (noun) a woman who is considered to be dangerously seductive | Synonyms: Delilah, enchantress, femme fatale, temptress |
| sirenian | (noun) any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs | Synonyms: sea cow, sirenian mammal |
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| siriasis | (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: insolation, sunstroke, thermic fever |
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| siris | (noun) large spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the wind | Synonyms: Albizia lebbeck, Albizzia lebbeck, siris tree |
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| sirloin | (noun) the portion of the loin (especially of beef) just in front of the rump | - |
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| sirocco | (noun) a windstorm that lifts up clouds of dust or sand | Synonyms: dust storm, duster, sandstorm |
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| sirrah | (noun) formerly a contemptuous term of address to an inferior man or boy; often used in anger | - |
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| sirup | (noun) a thick sweet sticky liquid | Synonyms: syrup |
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