nectosacn.
/ˈnɛktə(ʊ)sak/, U.S. /ˈnɛktəˌsæk/ Zoology. Now rare.
The inner or undersurface of a nectophore.
ΚΠ
1859 T. H. Huxley Oceanic Hydrozoa 15 The cavity of the cup, which, with its muscular wall, may be termed the nectosac.
1870 H. A. Nicholson Man. Zool. I. x. 85 The interior of the nectocalyx is often called the ‘nectosac’.
1964 Proc. Royal Soc. 1963–4 B. 159 374 Contraction of this system is responsible for the constriction of the nectosac and consequent ejection of water through the velar aperture which is the basis of swimming.
1992 Philos. Trans. (Royal Soc.) B. 335 281 The differences between the two genera are principally the arrangement of the radial canals to the nectosac and the shape of the hydroecium in the definitive nectophore.
This entry has been updated (OED Third Edition, September 2003; most recently modified version published online March 2022).
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