[tuh-lom-uh-reys, ‐reyz]
an enzyme, active chiefly in tumors and reproductive cells, that causes telomeres to lengthen: facilitates cell division and may account for the immortality of cancer cells.

telomere + -ase Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
telomerase (tɛˈlɒməˌreɪz)
an enzyme that is involved in the formation and repair of telomeres, so that chromosomes are not shortened during cell division

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
telomerase   (tə-lŏm'ə-rās', -rāz')  Pronunciation Key 
An enzyme that preserves the length of telomeres across cell divisions in germ cells, stem cells, and most cancer cells. A kind of reverse transcriptase, telomerase is an RNA-containing enzyme that synthesizes the DNA of telomeres by reverse transcription. It is active during DNA replication and is thought to play a role in the proliferation and apparent immortality of cells in which it is present. In cells that lack telomerase (that is, in most somatic cells of the body), the telomeres of chromosomes shorten and eventually disappear over repeated cell divisions. The inhibition of telomerase is being investigated as a method of killing cancerous cells. See more at telomere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These produce an enzyme called telomerase that repairs telomeres after cell
The reprogramming process activated the telomerase enzyme, which is responsible
  for maintaining telomeres.
When the virus is injected into an animal, the gene becomes active in cells
  that express telomerase.
They found that telomerase activation started glycolysis in cancer cells.
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