— hypotonicity /huy'poh toh nis"i tee/ , n.
/huy'peuh ton"ik/ , adj.
1. Physiol. (of tissue) having less than the normal tone.
2. Physical Chem. noting a solution of lower osmotic pressure than another solution with which it is compared (opposed to hypertonic ). Cf. isotonic (def. 1).
[ 1890-95; HYPO- + TONIC ]