tube

¹tube

noun \ˈt(y)üb\

Definition of TUBE

1

: a slender channel within a plant or animal body : duct—see bronchial tube, eustachian tube, fallopian tube

2

a : an often complex piece of laboratory or technical apparatus usually of glass and commonly serving to isolate or convey a product of reaction <a distillation tube> b : test tube

3

: a soft tubular container whose contents (as toothpaste) can be dispensed by squeezing

4

: a hollow cylindrical device (as a cannula) used for insertion into bodily passages or hollow organs for removal or injection of materials