planospiraladj.n.
/ˌpleɪnəʊˈspʌɪrəl/, /ˌpleɪnəʊˈspʌɪrl̩/, U.S. /ˌpleɪnoʊˈspaɪr(ə)l/ = planispiral adj. Also occasionally as n.
ΘΚΠ
the world > animals > invertebrates > phylum Arthropoda > class Insecta > order Lepidoptera or butterflies and moths > [adjective] > of parts > of spiral form (of proboscis)
planospiral1847
planispiral1890
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > belonging to order Pulmonifera > of or belonging to Inoperculata > of shells of genus Planorbis
planospiral1847
planispiral1890
flat-coiled1901
1847 Times 25 Jan. 6/6 A planospiral rotator is concealed within the hoop of a nave of one of the hind wheels, and gives action to a shaft or small rod of iron which is carried horizontally nearly as far as the opposite wheel.
1928 Q. Rev. Biol. 3 103/2 It entirely ignores the meaning of their prevailingly high and often greatly compressed, bilaterally symmetrical, planospiral shells.
1986 G. Culverwell tr. P. Arduini & G. Teruzzi Macdonald Encycl. Fossils No. 67 Gastropods included in the genus Lecanospira possess a modest-sized shell with planospiral coiling.
1995 D. L. Baars Navajo Country Gloss. 226 Shells that are chambered, usually coiled in a planospiral, but occasionally straight.
Derivatives
planoˈspirally adv.
ΚΠ
1967 Philos. Trans. (Royal Soc.) B. 252 88 (caption) Caprina adversa (with almost plano-spirally coiled upper valve).
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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adj.n.1847