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2 definitions found
 for Radical sign
From The Collaborative International Dictionary of English v.0.48 :

  Radical \Rad"i*cal\ (r[a^]d"[i^]*kal), a. [F., fr. L. radicalis
     having roots, fr. radix, -icis, a root. See Radix.]
     1. Of or pertaining to the root; proceeding directly from the
        [1913 Webster]
     2. Hence: Of or pertaining to the root or origin; reaching to
        the center, to the foundation, to the ultimate sources, to
        the principles, or the like; original; fundamental;
        thorough-going; unsparing; extreme; as, radical evils;
        radical reform; a radical party.
        [1913 Webster]
              The most determined exertions of that authority,
              against them, only showed their radical
              independence.                         --Burke.
        [1913 Webster]
     3. (Bot.)
        (a) Belonging to, or proceeding from, the root of a plant;
            as, radical tubers or hairs.
        (b) Proceeding from a rootlike stem, or one which does not
            rise above the ground; as, the radical leaves of the
            dandelion and the sidesaddle flower.
            [1913 Webster]
     4. (Philol.) Relating, or belonging, to the root, or ultimate
        source of derivation; as, a radical verbal form.
        [1913 Webster]
     5. (Math.) Of or pertaining to a radix or root; as, a radical
        quantity; a radical sign. See below.
        [1913 Webster]
     Radical axis of two circles. (Geom.) See under Axis.
     Radical pitch, the pitch or tone with which the utterance
        of a syllable begins. --Rush.
     Radical quantity (Alg.), a quantity to which the radical
        sign is prefixed; specifically, a quantity which is not a
        perfect power of the degree indicated by the radical sign;
        a surd.
     Radical sign (Math.), the sign [root] (originally the
        letter r, the initial of radix, root), placed before any
        quantity, denoting that its root is to be extracted; thus,
        [root]a, or [root](a + b). To indicate any other than the
        square root, a corresponding figure is placed over the
        sign; thus, [cuberoot]a, indicates the third or cube root
        of a.
     Radical stress (Elocution), force of utterance falling on
        the initial part of a syllable or sound.
     Radical vessels (Anat.), minute vessels which originate in
        the substance of the tissues.
        [1913 Webster]
     Syn: Primitive; original; natural; underived; fundamental;
     Usage: Radical, Entire. These words are frequently
            employed as interchangeable in describing some marked
            alteration in the condition of things. There is,
            however, an obvious difference between them. A radical
            cure, reform, etc., is one which goes to the root of
            the thing in question; and it is entire, in the sense
            that, by affecting the root, it affects in an
            appropriate degree the entire body nourished by the
            root; but it may not be entire in the sense of making
            a change complete in its nature, as well as in its
            extent. Hence, we speak of a radical change; a radical
            improvement; radical differences of opinion; while an
            entire change, an entire improvement, an entire
            difference of opinion, might indicate more than was
            actually intended. A certain change may be both
            radical and entire, in every sense.
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

  radical sign
      n 1: a sign indicating the extraction of a root

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