placentiformadj.
/pləˈsɛntᵻfɔːm/, U.S. /pləˈsɛn(t)əˌfɔrm/ Chiefly Zoology and Botany. Now rare.
Having the shape of a placenta; rounded and flat.
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the world > life > biology > physical aspects or shapes > shape > [adjective] > other shapes
plummet-like1605
semilunar1681
cordated1698
cordate1760
obcordate1775
club-shaped1776
flabelliform1777
obovate1785
button-shaped1791
clavate1803
placentiform?a1808
obovoid1819
valviform1819
constricted1826
vulviform1829
mitrate1836
bipenniform1842
sandaliform1848
scopiform1852
obclavate1856
obcordiform1857
oboval1857
utriform1860
broadsword-shaped1870
placentoid1885
hypsiloid1886
?a1808 Universal Syst. Nat. Hist. XIV. 593 Lowland or Bog Iron Ore... Sometimes massive, but commonly in detached lumps of various shapes, as placentiform, flat and rounded, [etc.].
1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Placentiformis,..Bot. resembling a cake..placentiform.
1861 R. Bentley Man. Bot. i. iii. 131 When what would be otherwise a napiform root becomes compressed both at its base and apex..it is said to be placentiform.
1883 Philos. Trans. (Royal Soc.) 174 384 In Myxine there is no skeleton to the six pairs of cake-shaped (placentiform) branchial pouches, but the whole structure is membranous.
1935 W. B. Grove Brit. Stem- & Leaf-Fungi I. 362 Amphorula sachalinensis... Pycnidia scattered, depressed-globose or placentiform.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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adj.?a1808