Participants would spit in a test tube before the start of the match, immediately after, and the next morning.
I've been eating those concentrates so long my stomach thinks I've turned into a test tube.
The end of the retort just touches the surface of the water in the test tube.
Silver ore may be detected by dissolving a small quantity in a test tube with a few drops of nitric acid.
That's what my inventor smelled; there never was any phenol in the test tube.
Pour some soft celloidin into a test tube; carefully revolve the test tube so that an even film of celloidin dries on the inside.
Clamp the test tube so that it rests in the water in the beaker.
"Yes, if you want to hold a test tube for me," answered Jack.
Clamp the thermometer so that it is held in the white of egg in the test tube.
Thirty cubic centimtres of fresh milk were placed in a test tube with one gram of borax.
test tube n.
A clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation.
Produced or cultivated in a test tube.
Conceived by or developed from fertilization in laboratory apparatus or by artificial insemination.