hy·po·ton·ic adj \ˌhī-pə-ˈtän-ik, -pō-\
: having deficient tone or tension <hypotonic children>
: having a lower osmotic pressure than a surrounding medium or a fluid under comparison <a hypotonic solution>—compare hypertonic 2, isotonic 1
—hy·po·ton·i·cal·ly \-i-k(ə-)lē\ adverb
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