septulumn.
/ˈsɛptjᵿləm/, /ˈsɛptʃᵿləm/, U.S. /ˈsɛpt(j)ələm/, /ˈsɛptʃələm/α. 1800s– septula (plural septulae).
β. 1800s– septulum.
Chiefly Anatomy, Botany, and Zoology.
A small, thin, or incomplete septum; spec. (in bryozoans) a poriferous plate in the wall separating adjacent zooids (cf. rosette plate n. (a) at rosette n. Compounds 3).
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septulum1800
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1800 A. Fyfe Compend. Anat. Human Body for Use Students II. iv. 149 These Septulæ begin at the root or Nucleus, situated at the back-part of the Testicle.
1821 S. F. Gray Nat. Arrangem. Brit. Plants I. 252 (caption) Pollen mass cut off transversely to show the septulum, cells, and grains, of which it is composed.
1872 H. Power tr. S. Stricker et al. Man. Human & Compar. Histol. II. xxx. 332 Transverse sections show that there are numerous septulæ traversing the white substance, and penetrating to the grey.
1925 Prof. Papers U.S. Geol. Surv. No. 136. 33/1 Each wall is perforated by a large septula, probably multiporous.
1982 N.Z. Jrnl. Zool. 9 2/1 Numerous small, multiporous septula occur in the distal and distolateral zooidal walls.
2007 Jrnl. Paleontol. 81 245/1 Transverse septula are generally less developed in the inner whorls..than in those of moderately to highly evolved forms of Lepidolina.
This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022).
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