One of the mysteries of the English language finally explained.
More fully "red rizzer": a redcurrant bush, Ribes rubrum; a fruit of this plant. Frequently attributive, as "rizzer-berry", "rizzer-bush". Also: (in full "white rizzer") a whitecurrant fruit or bush; (in full "black rizzer") a blackcurrant fruit or bush.
Late 16th century; earliest use found in Accounts of the Lord High Treasurer of Scotland. Probably a variant of russel, perhaps with assimilation of liquids ( r…l goes to r…r), or perhaps showing suffix substitution; perhaps compare also French rousseur redness, reddish colour. The forms with final -t, -d apparently show an excrescent final plosive.
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