isoform

noun

iso·​form ˈī-sə-ˌfȯrm How to pronounce isoform (audio)
: any of two or more functionally similar proteins that have a similar but not an identical amino acid sequence

Example Sentences

Recent Examples on the Web Vitamin E has eight different isoforms, or types, and each may do slightly different things in our bodies. Cosby Stone, The Conversation, 22 Nov. 2019 To be declared positive, a certain percentage of the resulting isoforms have to appear in a certain range, and that range is down, somewhat, to interpretation. Joe Lindsey, Outside Online, 3 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'isoform.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1983, in the meaning defined above

Time Traveler
The first known use of isoform was in 1983

Dictionary Entries Near isoform

Cite this Entry

“Isoform.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isoform. Accessed 29 Jan. 2023.

Medical Definition

isoform

noun
iso·​form ˈī-sə-ˌfȯrm How to pronounce isoform (audio)
: any of two or more functionally similar proteins that have a similar but not identical amino acid sequence and are either encoded by different genes or by RNA transcripts from the same gene which have had different exons removed
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