Having face blindness (prosopagnosia); unable to recognize faces.

(colloquial) To insist strongly (that something is true).

Alternative spelling of sandblind

Describing an experiment (usually medical) in which some information which might influence the trial is withheld from particular participants until the experiment is complete. Most commonly, information about treatment groups is withheld from subjects, but not the administrators.

Describing an experiment (usually medical) in which some information which might influence the experiment is withheld from three different parties until the outcome of the experiment is known: most commonly, the three parties are the subjects, the administrators, and the statisticians analysing the data.

(construction) the use of nails that are not exposed to the weather.

plural of blind spot

plural of blind alley

Haemorrhoids that do not bleed.

(mining) A level or drainage gallery which has a vertical shaft at each end, and acts as an inverted siphon.