An institution, building, or room for the exhibition and conservation of works of art. / An establishment that buys, sells, and displays works of art.

(Trinidad and Tobago) To show off.

A balcony or loft for musicians in a hall or church.

(medicine) Of or pertaining to milk, or the secretion of milk. / Relating to a galaxy. / (astronomy, specifically, sometimes capitalized) Relating to the Milky Way galaxy.

Wooden framework on which persons are put to death by hanging. / (colloquial, obsolete) A wretch who deserves to be hanged. / (printing, obsolete) The rest for the tympan when raised.

Third-person singular simple present indicative form of gallow

(historical) In the nineteenth century, the cheap seats at the back of a theatre or in the upper balcony.

(astronomy, dated) the Milky Way Galaxy, from before it was realized that the Milky Way was not the only "galaxy"

Galileo Galilei (1564–1642), an Italian thinker and key figure in the scientific revolution who improved the telescope, made astronomical observations, and put forward the basic principle of relativity in physics.

Great Galactic Ghoul