A surname from German.

The cardinal number occurring after seven hundred ninety-nine and before eight hundred one, represented in Arabic numerals as 800.

The number one thousand eight hundred. / The start of the nineteenth hour of the day on the 24-hour clock i.e. 18:00. / The year 1800.

(chiefly dated) The Republic of Ireland. / The island of Ireland, consisting of the Republic of Ireland and Northern Ireland

(physics) a theory that organizes subatomic particles into octets

Eight times as much; multiplied by eight. / Containing eight parts.

By a factor of eight.

(mathematics) A Riemann space in which the contracted curvature tensor is proportional to the metric tensor

(uncountable) The down of the eider duck, used for stuffing pillows and quilts. / (countable) A quilt stuffed with this down.

(historical) The peso, a silver coin that was minted in Spain and its colonies from the end of 15th century, equal to eight reales (hence the name).