[bey-suh l, -zuh l]


of, at, or forming the base.
forming a basis; fundamental; basic.
  1. indicating a standard low level of activity of an organism, as during total rest.
  2. of an amount required to maintain this level.
Medicine/Medical. serving to induce a preliminary or light anesthesia prior to total anesthetization.

Origin of basal

First recorded in 1820–30; base1 + -al1
Related formsba·sal·ly, adverbpre·ba·sal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for basal

Historical Examples of basal

British Dictionary definitions for basal



at, of, or constituting a base
of or constituting a foundation or basis; fundamental; essential
Derived Formsbasally, adverb
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

Word Origin and History for basal

"relating to a base," 1828, from base (n.) + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper

basal in Medicine


[bāsəl, -zəl]


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