plural of yellow boy

(countable, slang, now archaic, historical) A gold coin; a guinea or sovereign. / (uncountable, slang) Iron(III) hydroxide, a yellow-orange solid found in acidic water from mining projects.

A flood event that has a 1% probability of occurring in any given year; an exceptionally large flood.

plural of 100-year flood

A brilliant yellow pigment consisting of plumbic iodide.

A product intermediate between visual purple and visual white, formed by the photochemical action of light on visual purple.

A tropical climbing plant (Ipomoea tuberosa) related to the morning glory.

A rubiaceous shrub (Genipa clusiifolia) growing in the West Indies. / Its edible fruit.

Muntz metal / (UK, auctions) Gold (or some alloy of gold) that cannot be labelled as gold in the UK because it does not bear an Assay Office mark.

Any of various plants of the genus Barbarea, with yellow flowers.