† placoideann.adj.

Forms: 1800s placoidean, 1800s placoidian, 1800s placoïdian.

Origin: Probably a borrowing from French, combined with an English element. Etymons: French Placoïdes , -ean suffix.

Etymology: Probably < Placoïd- (in French Placoïdes: see placoid adj. and n.) + -ean suffix. Compare scientific Latin Placoidei , order name (1871 or earlier). Compare later placoid adj., placoid n. With the forms Placoïdian , Placoidian compare -ian suffix.

Zoology and Palaeontology. Obsolete.

A. n.

A fish of the former order Placoidei of cartilaginous fishes, which included sharks and rays; a placoid fish.

ΘΚΠ

the world > animals > fish > subclass Elasmobranchii > [noun] > member of division Placoidei

placoidean1836

placoid1845

1836 W. Buckland Geol. & Mineral. I. xiii. 269 (note) Placoidians... Fishes of this Order are characterized by having their skin covered irregularly with plates of enamel [etc.].

1857 R. Chambers Vestiges Nat. Hist. Creation 330 There is not one of them [sc. sauroids] in the Silurian formation, where placoideans appear to begin.

1870 H. Tuttle Arcana of Nature (new ed.) x. 180 The ganoids..were much more numerous than the placoidians, sharks, or rays.

B. adj.

Of or relating to the former order Placoidei.

ΘΚΠ

the world > animals > fish > subclass Elasmobranchii > [adjective] > of or relating to Placoidei

placoidean1836

placoid1842

placoidal1845

1836 W. Buckland Geol. & Mineral. I. xiii. 283 Genera of the first and second orders (Placoidean and Ganoidian)..ceased suddenly.

1857 R. Chambers Vestiges Nat. Hist. Creation 228 The above argument relates to the general fact of the first fishes being placoidean.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online December 2020).

单词	placoidean
释义	† placoideann.adj. Forms: 1800s placoidean, 1800s placoidian, 1800s placoïdian. Origin: Probably a borrowing from French, combined with an English element. Etymons: French Placoïdes , -ean suffix. Etymology: Probably < Placoïd- (in French Placoïdes: see placoid adj. and n.) + -ean suffix. Compare scientific Latin Placoidei , order name (1871 or earlier). Compare later placoid adj., placoid n. With the forms Placoïdian , Placoidian compare -ian suffix. Zoology and Palaeontology. Obsolete. A. n. A fish of the former order Placoidei of cartilaginous fishes, which included sharks and rays; a placoid fish. ΘΚΠ the world > animals > fish > subclass Elasmobranchii > [noun] > member of division Placoidei placoidean1836 placoid1845 1836 W. Buckland Geol. & Mineral. I. xiii. 269 (note) Placoidians... Fishes of this Order are characterized by having their skin covered irregularly with plates of enamel [etc.]. 1857 R. Chambers Vestiges Nat. Hist. Creation 330 There is not one of them [sc. sauroids] in the Silurian formation, where placoideans appear to begin. 1870 H. Tuttle Arcana of Nature (new ed.) x. 180 The ganoids..were much more numerous than the placoidians, sharks, or rays. B. adj. Of or relating to the former order Placoidei. ΘΚΠ the world > animals > fish > subclass Elasmobranchii > [adjective] > of or relating to Placoidei placoidean1836 placoid1842 placoidal1845 1836 W. Buckland Geol. & Mineral. I. xiii. 283 Genera of the first and second orders (Placoidean and Ganoidian)..ceased suddenly. 1857 R. Chambers Vestiges Nat. Hist. Creation 228 The above argument relates to the general fact of the first fishes being placoidean. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online December 2020). < n.adj.1836
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