A subject or area about which one is uninformed or misinformed, often because of a prejudice or lack of appreciation.
A location where radio reception and/or transmission is significantly poorer than in surrounding locations.
A location around an earthquake epicentre that is prone to earthquake.
An inability to recognize a fact or think clearly about a certain topic, especially because of a prejudice.
The place where the optic nerve attaches to the retina, and so where the retina cannot detect light.
The part of the railway/tramway track that cannot be seen in the side mirror or the side window.
In driving, the part of the road that cannot be seen in the rear-view mirror.
In a stadium or auditorium, any location affording those seated or standing there only an obstructed visual or auditory experience.
Inadequacy or incompleteness.
An insufficiency, especially of something essential to health.
The codimension of a linear system in the corresponding complete linear system.
The amount by which the number of double points on a curve is short of the maximum for curves of the same degree.