basal

[bey-suhl, -zuhl]
adjective
1.
of, at, or forming the base.
2.
forming a basis; fundamental; basic.
3.
Physiology.
a.
indicating a standard low level of activity of an organism, as during total rest.
b.
of an amount required to maintain this level.
4.
Medicine/Medical. serving to induce a preliminary or light anesthesia prior to total anesthetization.

Origin:
1820–30; base1 + -al1

basally, adverb
prebasal, adjective
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World English Dictionary
basal (ˈbeɪsəl)
 
adj
1.  at, of, or constituting a base
2.  of or constituting a foundation or basis; fundamental; essential
 
'basally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

basal
"relating to a base," 1828, from base + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

basal ba·sal (bā'səl, -zəl)
adj.

  1. Of, relating to, located at, or forming a base, usually of an organ or a tooth.

  2. Of, relating to, of situated at the lowest level, as of an organ.

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
Thin, noticeably downcurved bill, blue-gray on the basal half lower mandible.
Bill slightly downcurved, thicker at base with basal third of lower mandible
  blue-gray.
Secondaries and primaries dark brownish gray, secondaries and basal portions of
  primaries spotted with buff.
The problem is widely believed to begin in the basal ganglia, the part of the
  brain that controls motor function.
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