pin·nule

(pĭn′yo͞ol) also pin·nu·la (pĭn′yə-lə)

n. pl. pin·nules also pin·nu·lae (pĭn′yə-lē′)

1. Botany One of the secondary divisions of a binnately compound leaf.

2. Zoology A small featherlike part or subdivision of an appendage, especially one of the small branches on the arm of a crinoid.

[Latin pinnula, diminutive of pinna, feather; see pet- in Indo-European roots.]

pin′nu·lar adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pinnule

(ˈpɪnjuːl) or

pinnula

n, pl pinnules or pinnulae (ˈpɪnjʊˌliː)

1. (Botany) any of the lobes of a leaflet of a pinnate compound leaf, which is itself pinnately divided

2. (Zoology) zoology any feather-like part, such as any of the arms of a sea lily

[C16: from Latin pinnula, diminutive of pinna feather]

ˈpinnular adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

pin•nule

(ˈpɪn yul)

n.

1. a part or organ resembling a barb of a feather, a fin, or the like.

2. a secondary pinna, one of the pinnately disposed divisions of a bipinnate leaf.

[1585–95; < Latin pinnula, diminutive of pinna feather; see -ule]

pin′nu•lar (-yə lər) adj.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

pinnule - division of a usually pinnately divided leaf

pinna

leaflet - part of a compound leaf

Mentioned in

References in periodicals archive

The quantification of galls per pinnule was made from 20 samples, which were obtained from 12 plant individuals at the study site.

First record of galls in the tree fern Cyathea phalerata (Cyatheaceae) from a Tropical Rainforest in Brazil

A 3 mm X 5 mm square leaf sample was sectioned from the centre of a pinnule (leaflet) (between the midrib and the pinnule margin) collected from a central pinna.

Moringa oleifera (Horseradish Tree) Leaf Adaptation to Temperature Regimes

Fronds divided into 4-6 pinnule pairs; rachis winged 2.

Pteridophytes of southeast Alabama: Dichotomous keys, illustrations and distribution maps

Of these, most are attached to fragmentary, ultimate pinnae (Halle 1927, 1933; Arnold 1937; Zodrow and McCandlish 1980b) without pinnule replacement, or to fragmentary axes (Drinnan et al.

Note on different kinds of attachments in trigonocarpalean (Medullosales) ovules from the Pennsylvanian Sydney Coalfield, Canada

1) on the basis of the overall morphology, size and pinnule shape and despite the indistinct venation.

Floras en las capas rojas de la cuenca permica de Lodeve (Sur de Francia)

A particularly conspicuous feature of many scrambling/climbing pteridosperms is marginal thickenings of the lateral pinnule veins (e.g., in Blanzyopteris praedentata, Lescuropteris genuina, Mariopteris occidentalis [Fig.

How Paleozoic vines and lianas got off the ground: on scrambling and climbing Carboniferous--early Permian pteridosperms

11a illustrates yet another atypical foliar form, haired, by its comparatively narrow, long and linear pinnule, without basal orbicular pinnules, and with a conspicuous acuminate tip.

Foliar forms of Macroneuropteris scheuchzeri (Pennsylvanian, Sydney Coalfield, Nova Scotia, Canada)

Venation of pinnule or ultimate axis: 0 = not anastomosing; 1 = anastomosing.

FOSSILS AND FERN PHYLOGENY

acute to acuminate) tips, sinuses of the pinnule margins reached by one (vs.

Sandstone rockhouses of the Eastern United States, with particular reference to the ecology and evolution of the endemic plant taxa

In a quantitative analysis of pinnule formation in Adiantum and Cheilanthes, mitotic rates were compared for different developing leaf sectors (Zurakowski & Gifford, 1988).

Anatomy and development of the fern sporophyte

The proportion of dead frond (brown foliage with no living (green pinnules) coverage in relation to total L.

Austromusotima camptozonale (Lepidoptera: Crambidae) herbivory results in frond and rhizome mortality of the invasive fern Lygodium microphyllum (Schizaeles: Lygodiaceae)

Caulerpa cupressoides (Figure 1A) is characterized by a creeping axis fixed to the substrate by rhizoids pinnules arranged in the opposite direction, endowed with erect shoots (assimilative) pine tree-shaped distributed around the main axis (TRI, 2009).

Comparative study of sulfated polysaccharides from Caulerpa spp. (Chlorophyceae). Biotechnological tool for species identification?/Estudo comparativo dos polissacarideos sulfatados de cloroficeas Caulerpa spp. (Chlorophyceae). Ferramenta biotecnologica na identificacao de especies?