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单词 ramulus
释义

ramulusn.

Brit. /ˈramjᵿləs/, U.S. /ˈræmjələs/
Inflections: Plural ramuli Brit. /ˈramjᵿlʌɪ/, U.S. /ˈræmjəlaɪ/.
Forms: 1600s ramulis (plural, irregular), 1700s– ramulus.
Origin: A borrowing from Latin. Etymon: Latin rāmulus.
Etymology: < classical Latin rāmulus little branch, twig < rāmus branch (see ramus n.) + -ulus -ulus suffix. Compare earlier ramelet n., ramulet n.
1. Biology and Anatomy. A small branch; spec. a branch belonging to a second (or higher) order of branching.
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the world > life > biology > physical aspects or shapes > projection or protuberance > [noun] > branch
ramuscle1677
ramulus1678
ramusculus1825
ramuscule1828
the world > plants > part of plant > part defined by form or function > [noun] > branching part
ramulet1671
ramuscle1677
ramusculus1825
ramuscule1828
ramulus1872
furcation1874
1678 J. Gailhard Compl. Gentleman 57 The Spleen through several arteries, receiving heat from the heart, boileth the gross blood, which through certain little ramuli's or branches it doth convey into the neighbouring parts.
1700 C. Leigh Nat. Hist. Lancs. 83 This Humour is only brought thither by the ramuli of the Carotide Artery.
1714 W. Salmon Ars Anatomica xxxiv The second crural nerve..sends also a remarkable ramulus to the ankle and foot.
1760 J. Lee Introd. Bot. 167 Compound Stems, are such as are subdivided into Ramuli, small Branches, and diminish as they ascend.
c1783 Med. Communications 1 367 Those [vessels] may be traced..to the smaller ramuli.
1821 W. P. C. Barton Flora N. Amer. (new ed.) I. 79 In this case, the floriferous ramuli must be considered as racemous branches.
1872 H. C. Wood Contrib. Hist. Freshwater Algæ 207 Primary branches..densely ramellose with the ramuli lanceolate.
1920 Proc. Royal Soc. B. 91 227 A well-developed macula neglecta and a nerve ramulus supplied to it were found.
1985 Neurosci. Lett. 55 192 The HRP [= horseradish peroxidase] was dried onto the tips of insect pins..which were used to innoculate [sic] single nerve ramuli.
2003 Jrnl. Exper. Marine Biol. & Ecol. 283 2 A thin layer of sponge tissue..fills much of the space between the algal ramuli.
2. Botany. In certain plants belonging to the subfamily Tristichoideae of the family Podostemaceae: a photosynthetic organ with scaly leaves, variously considered to be homologous to a shoot or a compound leaf, or intermediate between these.
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1852 R. Wight Icones Plantarum Indiæ Orientalis V. ii. 35/2 Dalziella ramosissima (R.W.),..each flower bud usually accompanied with two slender, filiform, leafy ramuli.
1914 Jrnl. Linn. Soc.: Bot. 43 52 Even if we suppose the ramuli or short shoots [of Tristichaceæ] to be the precursors of the compound leaves of Podostemaceæ, the gap between the two families is a very large one.
1991 Plant Systematics & Evol. 178 195 Besides creeping organs (called roots) there are branched shoots with two kinds of short-lived photosynthetic appendages: scales and compound structures (called ramuli).
2001 Ann. Bot. 88 1189/2 The ramuli can be interpreted as short shoots.., as compound leaves (with radial leaflet arrangement) or as developmental mosaics combining both shoot and leaf features.
This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).
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