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Richard Roe
Richardson’s ground squirrel
riches
richly
Richmond
Richmond-upon-Thames
Richter scale
ricin
ricinoleic acid
ricinuleid
rick (1)
rick (2)
rickets
rickettsia
rickettsial pox
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ricin

ri·cin [ rss'n, ríss'n ]


noun 
Definition:
 
toxic plant substance: a highly toxic protein. Source: seeds of the castor oil plant. Use: destruction of cancer cells in treatments such as bone marrow transplants.

[Late 19th century. < Latin ricinus "castor oil plant"]
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