Tonus Meaning in Bengali

What is the meaning of word Tonus in Bengali/Bangla ?

Meaning of Tonus in Bangla is : টোনাস

increased tonus of the muscles about the eye

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blinking wildness infirmary leftie hospital teeter mouldy robustest toughness asperity coincide unkindly salon mercilessly shamefulness unmercifully hard-heartedly cruelly tonus