pilidiumn.

Brit.

/pʌɪˈlɪdɪəm/, U.S.

/paɪˈlɪdiəm/

Inflections: Plural pilidia.

Origin: Of multiple origins. A borrowing from Greek. Partly also a borrowing from French. Partly also a borrowing from Latin. Etymons: Greek πιλίδιον; French pilidium; Latin Pilidium.

Etymology: Ultimately < ancient Greek πιλίδιον little cap < πῖλος felt cap (see pileus n.) + -ίδιον -idium comb. form. In sense 1, via French pilidium (A. P. de Candolle Théorie élém. de la bot. (1815) 393). In sense 2, via scientific Latin Pilidium, genus name (J. Müller, probably 1846, in Vossische Zeitung; also 1847, in Arch. f. Anat. u. Physiol. 159). In sense 3, via scientific Latin Pilidium (A. T. von Middendorf Reise in den äussersten Norden u. Osten Sibiriens 1843 u. 1844 (1851) II. i. 214; compare also S. Forbes and S. C. T. Hanley Hist. Brit. Mollusca (1853) II. 440).

†1. Botany. A hemispherical apothecium that disintegrates into a powdery mass of spores, seen in certain lichens. Obsolete. rare.

ΚΠ

1832 J. Lindley Introd. Bot. i. iii. 205 Pilidium, an orbicular hemispherical shield, the outside of which changes to powder, as in Calycium.

1839 Boston Jrnl. Nat. Hist. 2 246 This differs so considerably from the other species with almost sessile pilidia, that it would almost seem to constitute a distinct genus.

2. Zoology. Also † Pilidium. The early, free-swimming, cap-shaped larva of nemertean worms of the order Heteronemertea (formerly thought to be a distinct genus).

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Nemertea > member of

nemertean1854

nemertian1868

pilidium1868

nemertid1870

nemertine1873

rhynchocoel1878

rhynchocoelan1960

1868 Amer. Naturalist 2 37 The egg hatching results in a larva (Pilidium) which is totally unlike the parent, and from the body-wall of which a small worm-like animal grows and separates, leaving the bulk of the Pilidium to perish.

1877 T. H. Huxley Man. Anat. Invertebrated Animals xi. 651 The production of the Nemertid larva within its pilidium.

1903 Science 27 Mar. 489/2 Nemertine egg..fragments may..give rise to closed blastulas, which may gastrulate normally and produce dwarf pilidia.

1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) vii. 273/1 After a free-swimming existence, the pilidium undergoes a complex metamorphosis into a young worm.

3. Zoology. In form Pilidium. Either of two former genera of molluscs, now called Piliscus (a genus of sea snails) and Iothia (a genus of limpets). Now disused.

ΚΠ

1879 Amer. Naturalist 13 31 Of names which have been adopted without that search into their credentials which would have shown them to be untenable, a few may be mentioned. Such are Portlandia Mörch.., Pilidium Midd., Pyrene Bolten, and Conulus Nardo.

1910 Encycl. Brit. XI. 510/1 Fam. 4.—Lepetidae. Neither ctenidia nor pallial branchiae... Pilidium.

This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).

单词	pilidium
释义	pilidiumn. Brit. /pʌɪˈlɪdɪəm/, U.S. /paɪˈlɪdiəm/ Inflections: Plural pilidia. Origin: Of multiple origins. A borrowing from Greek. Partly also a borrowing from French. Partly also a borrowing from Latin. Etymons: Greek πιλίδιον; French pilidium; Latin Pilidium. Etymology: Ultimately < ancient Greek πιλίδιον little cap < πῖλος felt cap (see pileus n.) + -ίδιον -idium comb. form. In sense 1, via French pilidium (A. P. de Candolle Théorie élém. de la bot. (1815) 393). In sense 2, via scientific Latin Pilidium, genus name (J. Müller, probably 1846, in Vossische Zeitung; also 1847, in Arch. f. Anat. u. Physiol. 159). In sense 3, via scientific Latin Pilidium (A. T. von Middendorf Reise in den äussersten Norden u. Osten Sibiriens 1843 u. 1844 (1851) II. i. 214; compare also S. Forbes and S. C. T. Hanley Hist. Brit. Mollusca (1853) II. 440). †1. Botany. A hemispherical apothecium that disintegrates into a powdery mass of spores, seen in certain lichens. Obsolete. rare. ΚΠ 1832 J. Lindley Introd. Bot. i. iii. 205 Pilidium, an orbicular hemispherical shield, the outside of which changes to powder, as in Calycium. 1839 Boston Jrnl. Nat. Hist. 2 246 This differs so considerably from the other species with almost sessile pilidia, that it would almost seem to constitute a distinct genus. 2. Zoology. Also † Pilidium. The early, free-swimming, cap-shaped larva of nemertean worms of the order Heteronemertea (formerly thought to be a distinct genus). ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Nemertea > member of nemertean1854 nemertian1868 pilidium1868 nemertid1870 nemertine1873 rhynchocoel1878 rhynchocoelan1960 1868 Amer. Naturalist 2 37 The egg hatching results in a larva (Pilidium) which is totally unlike the parent, and from the body-wall of which a small worm-like animal grows and separates, leaving the bulk of the Pilidium to perish. 1877 T. H. Huxley Man. Anat. Invertebrated Animals xi. 651 The production of the Nemertid larva within its pilidium. 1903 Science 27 Mar. 489/2 Nemertine egg..fragments may..give rise to closed blastulas, which may gastrulate normally and produce dwarf pilidia. 1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) vii. 273/1 After a free-swimming existence, the pilidium undergoes a complex metamorphosis into a young worm. 3. Zoology. In form Pilidium. Either of two former genera of molluscs, now called Piliscus (a genus of sea snails) and Iothia (a genus of limpets). Now disused. ΚΠ 1879 Amer. Naturalist 13 31 Of names which have been adopted without that search into their credentials which would have shown them to be untenable, a few may be mentioned. Such are Portlandia Mörch.., Pilidium Midd., Pyrene Bolten, and Conulus Nardo. 1910 Encycl. Brit. XI. 510/1 Fam. 4.—Lepetidae. Neither ctenidia nor pallial branchiae... Pilidium. This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022). < n.1832
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