test tube

1. 1.

   glass tube closed at one end

   Broadertube

Questions about test tube

What does test tube mean?

test tube means "glass tube closed at one end".

Is test tube a common word?

test tube is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.