isotonic

(без степеней сравнения)Having the same osmotic pressure.

isotonisch

изотони́ческийizotoníčeskij

(used of solutions) having the same or equal osmotic pressure

(без степеней сравнения)Having the same concentration of solutes as human blood.

Use an isotonic saline solution in your neti pot to prevent irritation of your nasal passages.

(без степеней сравнения)Having equal tension.

of two or more muscles; having equal tension

(без степеней сравнения)Of or involving muscular contraction against resistance in which the length of the muscle changes. Antonym is isometric. Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens). See also Wikipedia:Isotonic (exercise physiology)

of or involving muscular contraction in which tension is constant while length changes

(без степеней сравнения)Having the same tone.