the GNU version of the Collaborative International Dictionary of English
adj. Destitute of a mother; having lost a mother.
The Century Dictionary and Cyclopedia
Destitute of a mother; having lost a mother: as, motherless children.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having no living or known mother
Word Usage
"As someone whose mother died when she was 15, and mom was 37, the fear of leaving my children motherless is sometimes incapacitating, and particularly so since I do have a minor heart condition."