(inorganic chemistry, archaic) Nitric acid. / (alchemy) A corrosive liquor made of saltpeter, serving as a solvent for dissolving silver and all other metals except gold.

(phonetics) Immediately preceding a fortis consonant.

Cardinal number after forty-four and before forty-six.

(firearms) A .45-caliber firearm.

Forty plus two; the cardinal number following forty-one and preceding forty-three.

(idiomatic) A short sleep, an extra sleep, a nap.

The cardinal number immediately following forty-two and preceding forty-four.

The cardinal number immediately following forty-six and preceding forty-eight.

The cardinal number immediately following forty-eight and preceding fifty.

The cardinal number immediately following forty-seven and preceding forty-nine.