What is the meaning of Minnow?

Any small fish.

The common minnow (Phoxinus phoxinus), a small freshwater fish of the carp family Cyprinidae which has a green back with black elongated blotches, commonly swimming in large shoals.

Chiefly with a qualifying word: any of a number of other (small) fish from the family Cyprinidae; also , other small (usually freshwater) fish from other families.

Synonym of galaxiid (any member of the family Galaxiidae of mostly small freshwater fish of the Southern Hemisphere); specifically, the common galaxias, inanga, or jollytail (Galaxias maculatus).

Synonym of stickleback (family Gasterosteidae).

A person or thing of relatively little consequence, importance, or value.

An artificial bait in the form of a small fish.

Very small; tiny.

To fish for minnows (noun sense 1 and subsenses).

To fish, especially for trout, using minnows as bait.

Source: wiktionary.org