poikilosmotic
adjective
poi·kil·os·mot·ic
ˌpȯi-kil-äz-ˈmät-ik 
: having body fluids with an osmotic pressure similar to that of the surrounding medium
most lower marine invertebrates are poikilosmotic
compare homoiosmotic
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“Poikilosmotic.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/poikilosmotic. Accessed 25 Nov. 2024.
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