from The Century Dictionary.
- noun Plural of
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Bot.) See
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- noun Plural form of
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Most cultivars, particularly the dasheens, contain oxalic acid (0. 1-0.4 per cent fresh weight) mainly in the form of 'raphides', ie bunches of needle-shaped crystals of calcium oxalate embedded in the tissues.
Improperly prepared taro may cause irritation to the gums and mucous membranes due to the presence of raphides (oxalate crystals).
Under the microscope the slide was found to be covered with a mass of raphides.
From these experiments the absence of acridity in these two plants, in spite of the abundance of raphides, may readily be explained by the fact that the minute crystals are surrounded with and embedded in an insoluble mucilage, which prevents their free movement into the tongue and surface of the mouth, when portions of the plants are tasted.
The fuchsia and tradescantia contained bundles of raphides of the same form and equally as fine as those of the acrid plants.
Accordingly, four plants containing raphides were selected, two of which, the _Calla cassia_ and Indian turnip, were highly acrid, and two, the _Fuchsia_ and _Tradescantia_, or Wandering Jew, were perfectly bland to the taste.
This opinion was opposed by Prof. Burrill and other eminent botanists, who claimed that other plants, as the fuchsia, are not at all acrid, although they contain raphides as plentifully as the Indian turnip.
From this it will be seen that in this case the raphides did not separate from the mucilaginous juice to be held in suspension in the ether.
Some of these cells contain bundles of raphides (Fig. 2), one of which bundles is shown crushed in Fig. J.
The filtered ether was clear, entirely free from raphides, and had also lost every trace of its acridity.