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2 definitions found
 for plant louse
From The Collaborative International Dictionary of English v.0.48 :

  Plant \Plant\, n. [AS. plante, L. planta.]
     1. A vegetable; an organized living being, generally without
        feeling and voluntary motion, and having, when complete, a
        root, stem, and leaves, though consisting sometimes only
        of a single leafy expansion, or a series of cellules, or
        even a single cellule.
        [1913 Webster]
     Note: Plants are divided by their structure and methods of
           reproduction into two series, ph[ae]nogamous or
           flowering plants, which have true flowers and seeds,
           and cryptogamous or flowerless plants, which have no
           flowers, and reproduce by minute one-celled spores. In
           both series are minute and simple forms and others of
           great size and complexity.
           [1913 Webster] As to their mode of nutrition, plants
           may be considered as self-supporting and dependent.
           Self-supporting plants always contain chlorophyll, and
           subsist on air and moisture and the matter dissolved in
           moisture, and as a general rule they excrete oxygen,
           and use the carbonic acid to combine with water and
           form the material for their tissues. Dependent plants
           comprise all fungi and many flowering plants of a
           parasitic or saprophytic nature. As a rule, they have
           no chlorophyll, and subsist mainly or wholly on matter
           already organized, thus utilizing carbon compounds
           already existing, and not excreting oxygen. But there
           are plants which are partly dependent and partly
           [1913 Webster] The movements of climbing plants, of
           some insectivorous plants, of leaves, stamens, or
           pistils in certain plants, and the ciliary motion of
           zoospores, etc., may be considered a kind of voluntary
           [1913 Webster]
     2. A bush, or young tree; a sapling; hence, a stick or staff.
        "A plant of stubborn oak." --Dryden.
        [1913 Webster]
     3. The sole of the foot. [R.] "Knotty legs and plants of
        clay." --B. Jonson.
        [1913 Webster]
     4. (Com.) The whole machinery and apparatus employed in
        carrying on a trade or mechanical business; also,
        sometimes including real estate, and whatever represents
        investment of capital in the means of carrying on a
        business, but not including material worked upon or
        finished products; as, the plant of a foundry, a mill, or
        a railroad.
        [1913 Webster]
     5. A plan; an artifice; a swindle; a trick. [Slang]
        [1913 Webster]
              It was n't a bad plant, that of mine, on Fikey.
        [1913 Webster]
     6. (Zool.)
        (a) An oyster which has been bedded, in distinction from
            one of natural growth.
        (b) A young oyster suitable for transplanting. [Local,
            [1913 Webster]
            [1913 Webster]
     Plant bug (Zool.), any one of numerous hemipterous insects
        which injure the foliage of plants, as Lygus lineolaris,
        which damages wheat and trees.
     Plant cutter (Zool.), a South American passerine bird of
        the genus Phytotoma, family Phytotomid[ae]. It has a
        serrated bill with which it cuts off the young shoots and
        buds of plants, often doing much injury.
     Plant louse (Zool.), any small hemipterous insect which
        infests plants, especially those of the families
        Aphid[ae] and Psyllid[ae]; an aphid.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  plant louse
      n 1: any of several small insects especially aphids that feed by
           sucking the juices from plants [syn: plant louse,

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