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3 definitions found
 for Pinna
From The Collaborative International Dictionary of English v.0.48 :

  Pinna \Pin"na\, n.; pl. Pinn[ae], E. Pinnas. [L., a
     1. (Bot.)
        (a) A leaflet of a pinnate leaf. See Illust. of Bipinnate
            leaf, under Bipinnate.
        (b) One of the primary divisions of a decompound leaf.
            [1913 Webster]
     2. (Zool.) One of the divisions of a pinnate part or organ.
        [1913 Webster]
     3. [L. pinna, akin to Gr. ?.] (Zool.) Any species of Pinna,
        a genus of large bivalve mollusks found in all warm seas.
        The byssus consists of a large number of long, silky
        fibers, which have been used in manufacturing woven
        fabrics, as a curiosity.
        [1913 Webster]
     4. (Anat.) The auricle of the ear. See Ear.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Byssus \Bys"sus\, n.; pl. E. Byssuses; L. Byssi.[L. byssus
     fine flax, fine linen or cotton, Gr. by`ssos .]
     [1913 Webster]
     1. A cloth of exceedingly fine texture, used by the ancients.
        It is disputed whether it was of cotton, linen, or silk.
        [Written also byss and byssin.]
        [1913 Webster]
     2. (Zool.) A tuft of long, tough filaments which are formed
        in a groove of the foot, and issue from between the valves
        of certain bivalve mollusks, as the Pinna and Mytilus,
        by which they attach themselves to rocks, etc.
        [1913 Webster]
     3. (Bot.) An obsolete name for certain fungi composed of
        slender threads.
        [1913 Webster]
     4. Asbestus.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: division of a usually pinnately divided leaf [syn: pinna,
      2: the externally visible cartilaginous structure of the
         external ear [syn: auricle, pinna, ear]

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