of or pertaining to the outside or outer part; outer: an external surface.
Medicine/Medical. to be applied to the outside of a body, as a remedy: for external use only.
situated or being outside something; acting or coming from without: external influences.
pertaining to the outward or visible appearance or show: external acts of worship.
pertaining to or concerned with foreign countries: external affairs; external commerce.
Zoology, Anatomy. on the side farthest from the body, the median line, or the center of a radially symmetrical form.
Metaphysics. of or pertaining to the world of things, considered as independent of the perceiving mind: external world.
the outside; outer surface; exterior.
something that is external.
externals, external features, circumstances, etc.; outward appearance; superficialities.

1375–1425; late Middle English; see extern, -al1

externally, adverb
nonexternal, adjective, noun
nonexternally, adverb
quasi-external, adjective
quasi-externally, adverb
semiexternal, adjective
semiexternally, adverb
subexternal, adjective
subexternally, adverb

extraneous, external, extrinsic, internal, intrinsic.

1. outermost, exterior.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
external (ɪkˈstɜːnəl)
1.  of, situated on, or suitable for the outside; outer
2.  coming or acting from without: external evidence from an independent source
3.  of or involving foreign nations; foreign
4.  of, relating to, or designating a medicine that is applied to the outside of the body
5.  anatomy situated on or near the outside of the body: the external ear
6.  education denoting assessment by examiners who are not employed at the candidate's place of study
7.  (Austral), (NZ) (of a student) studying a university subject extramurally
8.  philosophy (of objects, etc) taken to exist independently of a perceiving mind
9.  (often plural) an external circumstance or aspect, esp one that is superficial or inessential
10.  (Austral), (NZ) a student taking an extramural subject
[C15: from Latin externus outward, from exterus on the outside, from ex out of]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s (as extern), from L. externus "outside, outward," from exterus (see exterior). This version won out over exterial. Related: Externality; externalize.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

external ex·ter·nal (ĭk-stûr'nəl)
Abbr. ext.
Relating to, connected with, or existing on the outside; exterior.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for externally
Vein the externally visible vascular bundles, found on leafs, petals and other parts.
Book gills are found externally while book lungs are found internally.
Externally fertilized eggs develop during a synchronized spawning.
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