| obsessive-compulsive disorder |
a mental disorder characterized by having unwanted and uncontrollable thoughts (obsessions), and/or engaging in repetitive and uncontrollable behaviors (compulsions); OCD. |
| obsessive-compulsive neurosis |
an emotional disorder characterized by compulsions, irresistible urges, or both, and often manifested in ritualistic behavior. |
| obsidian |
a dark, shiny volcanic glass, often used in jewelry, that fractures in a smooth, shell-like curve. |
| obsolesce |
to become or be in the process of becoming obsolete. |
| obsolescent |
in the process of going out of use or style; becoming obsolete. |
| obsolete |
no longer in use, as a word or expression, or as a type of implement or equipment. [2 definitions] |
| obstacle |
that which impedes or prevents forward movement or progress; obstruction. |
| obstetric |
of or pertaining to childbirth or obstetrics. |
| obstetrical |
of or relating to the care of women before, during, and after childbirth, or to the field of obstetrics. |
| obstetrician |
a medical doctor whose specialty is pregnancy and childbirth. |
| obstetrics |
(used with a sing. verb) the branch of medicine that deals with pregnancy and childbirth. |
| obstinacy |
the state or quality of being stubborn; stubbornness. [2 definitions] |
| obstinance |
the quality of holding stubbornly to one's own ideas or purposes; unwillingness to change or do what is asked. |
| obstinate |
holding stubbornly to one's own ideas or purposes; unwilling to change. [2 definitions] |
| obstreperous |
hard to control, as children resisting adult discipline; unruly. [2 definitions] |
| obstruct |
to clog or block. [3 definitions] |
| obstruction |
something that obstructs; obstacle or impediment. [3 definitions] |
| obstructionist |
anyone who deliberately prevents the ordinary conduct of affairs. |
| obtain |
to gain possession of; acquire. [2 definitions] |
| obtainable |
able to be obtained. |
| obtrude |
to thrust or force (oneself, one's concerns, or one's opinions) on another or others without being asked. [3 definitions] |