blot

1 :  to spot, stain, or spatter with a discoloring substance

2 obsolete :  mar; especially :  to stain with infamy

3a :  to dry (something, such as writing) with an absorbing agent hastily blotted her letterb :  to remove with absorbing material blotting up spilled water

1 :  to make a blot

2 :  to become marked with a blot

1 :  a lone backgammon man exposed to capture

2 archaic :  a weak or exposed point

1 :  a spot or stain of dirt or ink

2 :  a mark of shame or dishonor The lie was a blot on my record.

1 :  ²spot 1

2 :  to dry by pressing with paper or cloth

:  a nitrocellulose sheet that contains spots of immobilized macromolecules (as of DNA, RNA, or protein) or their fragments and that is used to identify specific components of the spots by applying a suitable molecular probe (as a complementary nucleic acid or a radiolabeled antibody)—see northern blot, southern blot, western blot