Learn Italian: Il medico analizza i campioni con il microscopio. - The doctor analyzes the samples with the microscope.

Analizza is the verb form, meaning 'he/she analyzes' (from the regular verb analizzare). It is related to the noun l'analisi (the analysis). Remember that l'analisi is one of those Greek-origin feminine nouns ending in -i that never changes its ending, meaning it stays the exact same in both the singular (l'analisi) and the plural (le analisi).

Why use medico instead of dottore for 'doctor'?

Il medico strictly refers to a medical doctor or physician. Il dottore is a broader term for anyone with a university degree, although Italians also use it in everyday speech to mean a medical doctor. Using medico makes it completely clear that this is a medical context.

Doesn't campioni usually mean 'champions'?

It can! The noun il campione translates to both 'the champion' (in sports) and 'the sample' or 'specimen' (in science and medicine). Context is key, and here with a doctor and a microscope, it definitely means 'samples'.

Why didn't con and il combine into col?