semimembranosusA muscle in the back of the thigh; the most medial of the three hamstring muscles (meaning it is more to the inner of the thighs, not between the two others in one leg, which is the semitendinosus).
SericanSynonym of Chinese or Northern Chinese, chiefly in the context of ancient Greco-Roman knowledge of China.
serotineAny of the genus Eptesicus of several small bats.
serotinousSynonym of serotine (“developing at a later time or later in a season, especially than is customary with allied species; specifically (botany), of a plant: flowering late in a season”).
serpentariaThe fibrous aromatic root of the Virginia snakeroot (Aristolochia serpentaria).
serpulaAny of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae that secrete a calcareous tube, usually irregularly contorted, but sometimes spirally coiled, with a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.
sextariusA Roman unit of liquid measure reckoned as the volume of 1+²⁄₃ Roman pounds of wine and equivalent to about 0.54 L although varying slightly over time.
significavitA writ issuing out of chancery, upon certificate given by the ordinary, of a man's standing excommunicate by the space of forty days, for the laying him up in prison till he submit himself to the authority of the church.
SmyrnaeanA native or inhabitant of (ancient) Smyrna. Contrast Smyrniot.
societas leoninaAn organization that is supposedly a partnership but in which one partner claims the lion's share.
societismA social philosophy that promotes the well-being of the group without sacrificing the significance of the individual.
sociusAny of the autonomous tribes and city states of the Italian Peninsula in permanent military alliance with the Roman Republic until the Social War of 91–88 BC.
sparidAny of several perciform fishes of the family Sparidae
spasmus nutansA syndrome characterised by the symptom triad of head nodding, ocular oscillations and anomalous head position (torticollis).
spathaA type of straight sword originating from the first-century Roman Empire. It was worn typically by cavalry officers and is a long version of the left shaped gladius.