cannula
Meaning
a thin tube inserted into a vein or body cavity to administer medication, drain fluid, or insert a surgical instrument.
Structure
Usage
The nurse inserted a cannula into the patient's vein to deliver the intravenous fluids.
A nasal cannula is used to deliver oxygen directly to a patient's nostrils.
The surgeon used a trocar and cannula to create a small portal for the laparoscopic camera.
Etymology
The word 'cannula' is a modern medical term with a direct lineage from classical languages. It originates from the Latin word cannula, a diminutive of canna, meaning 'reed' or 'tube'. Canna itself was borrowed from Greek kanna, also meaning 'reed', which is likely of Semitic origin. The literal meaning, 'a small reed or tube', perfectly captures the modern medical instrument's form and function—a slender, hollow conduit. This evolution from a simple natural object (a reed) to a precise medical device demonstrates a clear and logical semantic progression based on shared physical properties.
Analysis
cann (from Latin canna, meaning 'reed, tube', of Greek origin); ula (a Latin diminutive suffix indicating 'small').