nematogenn.
/ˈnɛmətədʒ(ə)n/, /ˈniːmətədʒ(ə)n/, /nəˈmatədʒ(ə)n/, U.S. /ˈnimədədʒ(ə)n/, /ˈnɛmədədʒ(ə)n/, /nəˈmædədʒ(ə)n/, /ˈnimədəˌdʒɛn/, /ˈnɛmədəˌdʒɛn/, /nəˈmædəˌdʒɛn/ 1. Zoology. In certain mesozoans: an adult form that can reproduce asexually via a vermiform larval stage or give rise to the sexual adult form (rhombogen).
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the world > animals > invertebrates > Mesozoa > [noun] > member of > nematogen
nematogen1883
1883 C. O. Whitman in Mittheilungen aus Zool. Station zu Neapel 4 59 I found two of these bodies within the same Nematogen.
1896 Cambr. Nat. Hist. II. 94 Other individuals which produce a more elongated larva..are called Nematogens.
1899 Zoologischer Anzeiger 22 171 The mother of vermiform embryos is called a nematogen, the mother of infusoriform embryos a rhombogen.
1954 Sci. Monthly Nov. 279/2 The stem nematogen..is the earliest stage to have have found in baby cephalopods and is thought to be the infecting agent.
2002 Jrnl. Parasitol. 88 325 Nematogens and vermiform embryos of a new species of Dicyema are described from an octopus collected off Veracruz, Mexico.
2. Physical Chemistry. A substance which can under certain conditions behave as a nematic liquid crystal.
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1975 Proc. Royal Soc. A. 343 389 One of the most direct methods for investigating the consequences of an orientation-dependent torque is dielectric relaxation and several studies of nematogens have been reported.
1994 Philos. Trans. (Royal Soc.) A. 348 60 Complex self ordering is shown to arise in the combined cases where main and side chain nematogens compete for the most favourable nematic direction.
2001 Jrnl. Amer. Chem. Soc. 123 12343 This morphology is essentially that of a heavily perforated lamellar bilayer phase and explains why this medium remains liquid crystalline well below the Onsager limit for disk-shaped nematogens.
This entry has been updated (OED Third Edition, September 2003; most recently modified version published online March 2022).
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n.1883