adj. Growing old; decaying with the lapse of time.
adj. characteristic of old age
the GNU version of the Collaborative International Dictionary of English
adj. Growing old; decaying with the lapse of time.
The Century Dictionary and Cyclopedia
Growing old; aging: as, a senescent beau.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. growing old
Word Usage
"Using a complex “systems biology” approach, the researchers, in conjunction with scientists from the University of Ulm in Germany, had set out to discover why cells become senescent, or, in other words, grow old."