from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, located at, or constituting an apex.
  • adj. Linguistics Of, relating to, or articulated with the tip of the tongue, as (t), (d), and (s).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of or connected with the apex
  • adj. situated at the growing tip of the plant or its roots, in comparison with intercalary growth situated between zones of permanent tissue.

from the GNU version of the Collaborative International Dictionary of English

  • adj. At or belonging to an apex, tip, or summit.

from The Century Dictionary and Cyclopedia

  • Relating to the apex or top; belonging to the pointed end of a cone-shaped body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. situated at an apex


from The American Heritage® Dictionary of the English Language, 4th Edition

From Latin apex, apic-, top.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From apex.


  • The condition is also known as apical ballooning syndrome ABS and stress cardiomyopathy. Front Page

  • Between late stage 16 and mid-stage 17 the apical plasma membrane of epidermal cells forms regular corrugations called apical undulae (au), at the tip of which chitin synthesis takes place, while secretion occurs at the valley between the corrugations (D).

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  • Plants have a mechanism called apical dominance, by which axillary buds are prevented from growing at the same time as the terminal bud-the tip of the plant stem.


  • Plowe and his colleagues tested a vaccine that targets a molecule on the malaria parasite known as apical membrane antigen 1 (AMA1).

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  • Here we report through ultrastructural analysis that IBC exhibits a high degree of cellular organization with polar elements such as apical/lateral positioning of E-cadherin, apical surface microvilli, and tortuous lumen-like (canalis) structures.

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  • Organisation of the procuticle is supposedly controlled by the apical plasma membrane that forms longitudinal corrugations called apical undulae during chitin synthesis that run perpendicular to the anterior-posterior axis of the developing embryo (

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  • Within the first week, Saudi Arabia had gathered massive humanitarian aid at the behest of apical leadership.

    Qanta Ahmed, MD: Israel and the Flotilla: On the Dangers of a Binary View

  • Damage to foliage and apical meristems occurs when they are "triggered" to premature bud burst and development by an earlier onset of the growing season (resulting from early snowmelt) when the annual hardening/dehardening process is at its most sensitive phase, and when there is a risk of short periods of cold weather.

    Phenotypic responses of arctic species to changes in climate and ultraviolet-B radiation

  • The epithelia secrete them constitutively into the thin layer of fluid that lies above the apical surface of the epithelium but below the viscous mucous layer.

    Vitamin D and influenza | The Blog of Michael R. Eades, M.D.

  • The new species is highly adapted to hypogean life with very obvious troglobiomorphic features: unpigmented cuticle, an extraordinary lengthening of thorax and appendixes, multiplication of antennomeres and supernumerary placoid sensilla, not just in the apical antennomere but also in the preceding antennomeres.

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