Definition of Placoid

1. Adjective. As the hard flattened scales of e.g. sharks.

Exact synonyms: Platelike
Similar to: Planar, Two-dimensional



Definition of Placoid

1. a. Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

2. n. Any fish having placoid scales, as the sharks.

Definition of Placoid

1. Adjective. platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids. ¹

2. Noun. Any fish having placoid scales, such as the sharks. ¹

¹ Source: wiktionary.com

Definition of Placoid

1. a fish having platelike scales [n -S]

Medical Definition of Placoid

1. Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids. Origin: Gr, a tablet. Any fish having placoid scales, as the sharks. One of the Placoides. Source: Websters Dictionary (01 Mar 1998)

Placoid Pictures

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Lexicographical Neighbors of Placoid

placits
placitum
plack
placket
plackets
placks
placode
placoderm
placodermal
placodermata
placodermi
placoderms
placodes
placoganoid
placoganoidei
placoid (current term)
placoides
placoidian
placoidians
placoids
placophora
placozoa
placozoan
placozoans
placque
pladaroma
pladdies
pladdy
plafond
plafonds

Literary usage of Placoid

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopedia Americana: A Library of Universal Knowledge (1919)
"... pla-koi'de-I, the name of an obsolete grouping of fishes, including those with placoid ... placoid ..."

2. Practical Geology and Mineralogy: With Instructions for the Qualitative by Joshua Trimmer (1842)
"The placoid fishes (from *Xag a broad plate) are characterized by having the skin irregularly covered with ... 173 placoid. Ganoid. The ctenoid fishes (from ..."

3. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and (1910)
"The most ancient type of bony skeleton appears to be represented in the placoid elements such as arc seen in the /CV ^^ skin of the Sela- ЮМ ..."

4. Geology of Oxford and the Valley of the Thames by John Phillips (1871)
"The names are chiefly from Agassiz. Diagram XXXVII. Teeth of placoid Fishes. Stonesfield. Natural size. 1. ..."

5. The Encyclopedia Americana: A Library of Universal Knowledge (1919)
"... pla-koi'de-I, the name of an obsolete grouping of fishes, including those with placoid ... placoid ..."

6. Practical Geology and Mineralogy: With Instructions for the Qualitative by Joshua Trimmer (1842)
"The placoid fishes (from *Xag a broad plate) are characterized by having the skin irregularly covered with ... 173 placoid. Ganoid. The ctenoid fishes (from ..."

7. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and (1910)
"The most ancient type of bony skeleton appears to be represented in the placoid elements such as arc seen in the /CV ^^ skin of the Sela- ЮМ ..."

8. Geology of Oxford and the Valley of the Thames by John Phillips (1871)
"The names are chiefly from Agassiz. Diagram XXXVII. Teeth of placoid Fishes. Stonesfield. Natural size. 1. ..."

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