SINGLE-ACTION ENGINE. See [Atmospheric Steam-engine].

SINGLE ANCHOR. A ship unmoored, having hove up one bower, rides by the other.

SING SMALL. To make a bullying boaster sing small, by lowering his arrogance.

SINICAL QUADRANT. See [Quadrant].

SINNET. See [Sennit].

SIR. Once a scholastic title applied to priests and curates; now to knights. "Aye, aye, sir," is the well-known answer from seamen, denoting 'cuteness, combined with good humour and obedience.

SIRIUS. The principal star, α, of the constellation Canis Major, and the brightest in the heavens; the dog-star.

SIROCCO. An oppressively hot parching wind from the deserts of Africa, which in the southern part of Italy and Sicily comes from the south-east; it sometimes commences faintly about the summer solstice.

SISERARA, or Surserara. A tremendous blow; or a violent rebuke.

SISSOO. An Indian timber much used in the construction of country ships.