| ̷ ̷ ̷ ̷|tänik adjective
Etymology: International Scientific Vocabulary is- + tonic
1. : of, relating to, or exhibiting equal tension ; specifically of muscular contraction : taking place in the absence of significant resistance with marked shortening of muscle fibers and without great increase in muscle tone — compare isometric
2. : having the same or equal osmotic pressure : isosmotic — used of solutions
an isotonic salt solution in which blood cells are counted
— compare hypertonic , hypotonic
• iso·ton·i·cal·ly -nə̇k(ə)lē adverb