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2 definitions found
 for Oil of bitter almonds
From The Collaborative International Dictionary of English v.0.48 :

  Almond \Alm"ond\ ([aum]"m[u^]nd), n. [OE. almande, almaunde,
     alemaunde, F. amande, L. amygdala, fr. Gr. 'amygda`lh: cf.
     Sp. almendra. Cf. Amygdalate.]
     1. The fruit of the almond tree.
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     Note: The different kinds, as bitter, sweet, thin-shelled,
           thick-shelled almonds, and Jordan almonds, are the
           products of different varieties of the one species,
           Amygdalus communis, a native of the Mediterranean
           region and western Asia.
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     2. The tree that bears the fruit; almond tree.
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     3. Anything shaped like an almond. Specifically: (Anat.) One
        of the tonsils.
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     Almond oil, fixed oil expressed from sweet or bitter
     Oil of bitter almonds, a poisonous volatile oil obtained
        from bitter almonds by maceration and distillation;
        benzoic aldehyde.
     Imitation oil of bitter almonds, nitrobenzene.
     Almond tree (Bot.), the tree bearing the almond.
     Almond willow (Bot.), a willow which has leaves that are of
        a light green on both sides; almond-leaved willow ({Salix
        amygdalina). --Shenstone.
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From The Collaborative International Dictionary of English v.0.48 :

  Essential \Es*sen"tial\ ([e^]s*s[e^]n"sjal), a. [Cf. F.
     essentiel. See Essence.]
     1. Belonging to the essence, or that which makes an object,
        or class of objects, what it is.
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              Majestic as the voice sometimes became, there was
              forever in it an essential character of
              plaintiveness.                        --Hawthorne.
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     2. Hence, really existing; existent.
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              Is it true, that thou art but a name,
              And no essential thing?               --Webster
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     3. Important in the highest degree; indispensable to the
        attainment of an object; indispensably necessary.
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              Judgment's more essential to a general
              Than courage.                         --Denham.
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              How to live? -- that is the essential question for
              us.                                   --H. Spencer.
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     4. Containing the essence or characteristic portion of a
        substance, as of a plant; highly rectified; pure; hence,
        unmixed; as, an essential oil. "Mine own essential
        horror." --Ford.
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     5. (Mus.) Necessary; indispensable; -- said of those tones
        which constitute a chord, in distinction from ornamental
        or passing tones.
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     6. (Med.) Idiopathic; independent of other diseases.
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     Essential character (Biol.), the prominent characteristics
        which serve to distinguish one genus, species, etc., from
     Essential disease, Essential fever (Med.), one that is
        not dependent on another.
     Essential oils (Chem.), a class of volatile oils, extracted
        from plants, fruits, or flowers, having each its
        characteristic odor, and hot burning taste. They are used
        in essences, perfumery, etc., and include many varieties
        of compounds; as lemon oil is a terpene, oil of bitter
        almonds an aldehyde, oil of wintergreen an ethereal
        salt, etc.; -- called also volatile oils in distinction
        from the fixed or nonvolatile.
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