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under active

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un⋅der⋅ac⋅tive

[uhn-der-ak-tiv]
–adjective
insufficiently active: an underactive thyroid gland.

Origin:
1955–60; under- + active


un⋅der⋅ac⋅tiv⋅i⋅ty, un⋅der⋅ac⋅tive⋅ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: un·der·ac·tive
Pronunciation: -'ak-tiv
Function: adjective
: characterized by an abnormally low level of activity underactive thyroid gland> —un·der·ac·tiv·i·ty /-ak-'tiv-&t-E/ noun plural -ties
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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