Placoid

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Placoid \Plac"oid\, a. [Gr. pla`x, plako`s, a tablet + -oid.]
     (Zool.)
     Platelike; having irregular, platelike, bony scales, often
     bearing spines; pertaining to the placoids.
     [1913 Webster]



From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Placoid \Plac"oid\, n. (Zool.)
     (a) Any fish having placoid scales, as the sharks.
     (b) One of the Placoides.
         [1913 Webster]

From WordNet (r) 2.0 [wn]:

  placoid
       adj : as the hard flattened scales of e.g. sharks [syn: {platelike}]