isotonic

adjective

iso·​ton·​ic ˌī-sə-ˈtä-nik 

1

: of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone compare isometric

2

: isosmotic

—used of solutions

isotonically

ˌī-sə-ˈtä-ni-k(ə-)lē 

adverb

isotonicity

ˌī-sə-tō-ˈni-sə-tē 

noun

Examples of isotonic in a Sentence

Recent Examples on the Web

Sets were littered with ice coolers and sachets of isotonic powder. —Charlie Campbell, TIME, 24 Jan. 2025

Solution: The solution that is packaged with neti pots includes an isotonic solution of salt water. —Caroline Thomason, Verywell Health, 15 Dec. 2023

Includes the value of in-kind products and services provided as part of a corporate sponsorship (e.g., equipment, apparel, soft drinks, water and isotonic products). —Usa Today Sports, USA TODAY, 14 Oct. 2021

Cleansing with paint thinner and isotonic saline solution was necessary. —Discover Magazine, 19 Nov. 2019

Word History

Etymology

International Scientific Vocabulary

First Known Use

1891, in the meaning defined at sense 1

Rhymes for isotonic

• anharmonic
• anionic
• avionic
• catatonic
• cationic
• chorionic
• cosmogonic
• diachronic
• diatonic
• electronic
• embryonic
• excitonic

Medical Definition

isotonic

adjective

iso·​ton·​ic ˌī-sə-ˈtän-ik 

1

: of, relating to, or exhibiting equal osmotic pressure

isotonic solutions

compare hypertonic sense 2, hypotonic sense 2

2

: of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone compare isometric sense 2

isotonically

-i-k(ə-)lē 

adverb

isotonicity

-tō-ˈnis-ət-ē 

noun

plural isotonicities