or A.S.E.



a suffix used in the names of enzymes: oxidase.

Origin of -ase

extracted from diastase Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ase

Historical Examples of ase

  • "They won't BE done till you go, Ase," continued the master of the house.

    Cy Whittaker's Place

    Joseph C. Lincoln

  • Soon's Mrs. Peabody wired you was goin' to ride, me and Ase started to meet you.

    Cy Whittaker's Place

    Joseph C. Lincoln

  • If Ase could afford clothes like that he might be his twin brother.

    Kent Knowles: Quahaug

    Joseph C. Lincoln

  • Ase was there, and his eyes pretty nigh popped out of his head.

    Cape Cod Stories

    Joseph C. Lincoln

  • Ase and he are pretty thick; he's got a mortgage on Ase's house, you know.

    The Rise of Roscoe Paine

    Joseph C. Lincoln

British Dictionary definitions for ase


suffix forming nouns

indicating an enzymeoxidase

Word Origin for -ase

abstracted from diastase
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ase


word-forming element used in naming enzymes, from ending of diastase.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ase



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for ase


A suffix used to form the names of enzymes. It is often added to the name of the compound that the enzyme breaks down, as in lactase, which breaks down lactose. It is also added to a word describing the enzyme's activity, as in transferase, which catalyzes the transfer of a chemical group from one molecule to another, or reductase, which catalyzes the reduction of an organic compound.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.