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The seed of this plant is the source of castor type oil.

Castor Bean

The seed of this plant is the source of castor type oil.

A nocturnal, semi-aquatic rodent.

Beavers

A nocturnal, semi-aquatic rodent.

A caster (or castor) is an undriven, single, double, or compound wheel mounted on an object to make movement easier.

Wheel Caster

A caster (or castor) is an undriven, single, double, or compound wheel mounted on an object to make…

"Castor and Pollux capturing the Giant Talus" — Gayley, 1893

Castor

"Castor and Pollux capturing the Giant Talus" — Gayley, 1893

"Castor and Pollux capturing the Giant Talus" — Gayley, 1893

Castor

"Castor and Pollux capturing the Giant Talus" — Gayley, 1893

"Vertical and Longitudinal section through skull of Castor Fiber, showing the cerebral cavity, the greatly-developed turbinal lamellae, the mode of implantation of the large over-growing chisel-edged incisor, and the curved rootless molars." —The Encyclopedia Britannica, 1903

Castor Fiber

"Vertical and Longitudinal section through skull of Castor Fiber, showing the cerebral cavity, the greatly-developed…

"Columns of Temple of Castor, Temple of Augustus, and Palatine Hill." — Young, 1901

Columns of Temple of Castor

"Columns of Temple of Castor, Temple of Augustus, and Palatine Hill." — Young, 1901

The Twins, Castor and Pollux constellation.

The Twins

The Twins, Castor and Pollux constellation.

"The third sign of the zodiac, so named from its 2 brightest stars, Castor, of the 1st magnitude, farthest to the west, and Pollux of the 2d, farthest to the east. Its constitutent stars form a binary system revolving in about 250 years. The sun is in G. from about May 21st, till about June 21st." — Williams, 1889

Gemini

"The third sign of the zodiac, so named from its 2 brightest stars, Castor, of the 1st magnitude, farthest…

"A zodiacal constellation, giving its name to a sign of the zodiac, lying east of Taurus, on the other side of the Milky Way." -Whitney, 1911

Gemini

"A zodiacal constellation, giving its name to a sign of the zodiac, lying east of Taurus, on the other…

A medal of Adramyttium which depicts icons of Castor and Pollux, two dieties of mariners, who were revered in this city.

Medal of Adramyttium

A medal of Adramyttium which depicts icons of Castor and Pollux, two dieties of mariners, who were revered…

"Castor and Pollux were the offspring of Leda and the Swan, under which disguise Jupiter had concealed himself. Leda gave birth to an egg, from which sprang the twins." —Bulfinch, 1897

The Dioscuri

"Castor and Pollux were the offspring of Leda and the Swan, under which disguise Jupiter had concealed…