Dictionary.com
definitions

sinistrality

[sin-uh-stral-i-tee]
noun
  1. the state or quality of having the left side or its parts or members different from and, usually, more efficient than the right side or its parts or members; left-handedness.
  2. preference for using the left hand or side.
  3. the state of being sinistral.
Compare dextrality.

Origin of sinistrality

First recorded in 1850–55; sinistral + -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sinistrality in Medicine

sinistrality

[sĭn′ĭ-străl′ĭ-tē]
n.
  1. Preference for the left hand in performing manual tasks; left-handedness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.