Hydrogenation Definition: Hydrogenation is a reduction reaction which results in an addition of hydrogen (usually as H2). If an organic compound is hydrogenated, it becomes more 'saturated'. Hydrogenation has many applications, but most people are familiar with the reaction as the one used to make liquid oils into semi-solid and solid fats.
thistle in American English (ËÎ¸ÉªsÉl ; t hisËÉl) noun. any of various plants (as genera Onopordum, Cirsium, and Cnicus) of the composite family, with prickly leaves and heads of white, purple, pink, or yellow flowers; esp., the Scotch thistle (O. acanthium) with white down and lavender flowers.
Cirsium vulgare (spear thistle) is a species of the genus Cirsium, native throughout most of Europe (north to 66Â°N, locally 68Â°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains).It is also naturalised in North America, Africa, and Australia and is as an invasive weed in some areas.. vulgare, growing on the bank of the Murrumbidgee River in Wagga Wagga, Australia. Spear thistle is designated an injurious weed under the UK Weeds Act 1959, and a noxious weed in Australia and in nine US states.