placoid

[ plak-oid ]

/ ˈplæk ɔɪd /

adjective

platelike, as the scales or dermal investments of sharks.

Origin of placoid

1835–45; <Greek plak- (stem of pláx) something flat, tablet + -oid

Words nearby placoid

plack, plackart, placket, placode, placoderm, placoid, plafond, plagal, plagal cadence, plage, plagiarism

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for placoid

The Thornback Skate is covered with prickles (placoid scales).
Stories of the Universe: Animal Life|B. Lindsay
In some cases the placoid scales are enlarged to form plates or spines capped or coated with enamel.
The Vertebrate Skeleton|Sidney H. Reynolds
In the groups of fishes above the Selachians, the coating of placoid elements shows various modifications.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3|Various
In the Selachians the bony skeleton is restricted to the placoid elements.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3|Various

The teeth of Selachii are fundamentally identical with placoid scales.
The Vertebrate Skeleton|Sidney H. Reynolds

British Dictionary definitions for placoid

placoid

/ (ˈplækɔɪd) /

adjective

platelike or flattened

(of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity

Word Origin for placoid

C19: from Greek plac-, plax flat

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

单词	placoid
释义	placoid [ plak-oid ] / ˈplæk ɔɪd / adjective platelike, as the scales or dermal investments of sharks. Origin of placoid 1835–45; <Greek plak- (stem of pláx) something flat, tablet + -oid Words nearby placoid plack, plackart, placket, placode, placoderm, placoid, plafond, plagal, plagal cadence, plage, plagiarism Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for placoid The Thornback Skate is covered with prickles (placoid scales). Stories of the Universe: Animal Life\|B. Lindsay In some cases the placoid scales are enlarged to form plates or spines capped or coated with enamel. The Vertebrate Skeleton\|Sidney H. Reynolds In the groups of fishes above the Selachians, the coating of placoid elements shows various modifications. Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3\|Various In the Selachians the bony skeleton is restricted to the placoid elements. Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3\|Various The teeth of Selachii are fundamentally identical with placoid scales. The Vertebrate Skeleton\|Sidney H. Reynolds British Dictionary definitions for placoid placoid / (ˈplækɔɪd) / adjective platelike or flattened (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity Word Origin for placoid C19: from Greek plac-, plax flat Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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