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costa

[kos-tuh, kaw-stuh] /ˈkɒs tə, ˈkɔ stə/
noun, plural costae
[kos-tee, kaw-stee] /ˈkɒs ti, ˈkɔ sti/ (Show IPA)
1.
a rib or riblike part.
2.
the midrib of a leaf in mosses.
3.
a ridge.
4.
Entomology.
  1. Also called costal vein. a vein, usually marginal, in the anterior portion of the wing of certain insects.
  2. Also called costal margin. the anterior edge or border of the wing of certain insects.
Origin of costa
1865-1870
1865-70; < Latin: rib, side. See coast
Related forms
pseudocosta, noun, plural pseudocostae.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for costal margin
Historical Examples
  • There are also three black spots on the front or costal margin, and the veins are black.

  • Stigmal vein parallel, in general trend, with the costal margin.

  • Its fore wings are brownish grey, crossed with zigzag darker lines, and having a black spot near the centre of the costal margin.

    Butterflies and Moths William S. Furneaux
  • The fore wings are of a dull yellow colour, with rosy-red hind margins, and a broad border of the same tint on the costal margin.

    Butterflies and Moths William S. Furneaux
  • The costal margin of the fore wing at the base is strongly angulated, and the posterior margin of the primaries is straight.

    The Butterfly Book William Jacob Holland
  • Its fore wings are ochreous and glossy, with a silvery streak from the base, running almost parallel with the costal margin.

    Butterflies and Moths William S. Furneaux
  • A small dark spot also lies near the middle of the costal margin of each of the four wings.

    Butterflies and Moths William S. Furneaux
  • The costal margin of the hind wings is clothed with tufted erect hairs in the male sex.

    The Butterfly Book William Jacob Holland
  • In the majority of insects the costal margin is marked with strong colour.

  • costal margin: the anterior margin of a wing whether it is really costate or not.

British Dictionary definitions for costal margin

costa

/ˈkɒstə/
noun (pl) -tae (-tiː)
1.
the technical name for rib1 (sense 1)
2.
a riblike part, such as the midrib of a plant leaf
Derived Forms
costal, adjective
Word Origin
C19: from Latin: rib, side, wall
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for costal margin

costa

n.

Spanish costa "coast," from same Latin source as English coast (n.). Used in Britain from 1960s in jocular formations (costa geriatrica, costa del crime, etc.) in imitation of the names of Spanish tourist destinations.

Online Etymology Dictionary, © 2010 Douglas Harper
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costal margin in Medicine

costa cos·ta (kŏs'tə)
n. pl. cos·tae (-tē)

  1. Rib.

  2. A rodlike internal supporting organelle that runs along the base of the undulating membrane of certain flagellate parasites. Also called basal rod.


cos'tal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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costal margin in Science
costa
  (kŏs'tə)   
Plural costae (kŏs'tē)
A rib or a riblike part, such as the midrib of a leaf or a thickened anterior vein or margin of an insect's wing.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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