The word part "sub-" is a prefix that means "under, from below".

3 дня назад · a prefix indicating a basic compound: subacetate; subcarbonate; subnitrate. a prefix indicating that the element is present in a relatively small proportion.

sub- prefix (LESS THAN) less than a number or level: Winter weather brought sub-zero (= less than 0 degrees) temperatures to much of the country.

​(in nouns and adjectives) below; less than. sub-zero temperatures; a subtropical (= almost tropical) climate; substandard. Want to learn more?

SUB- meaning: 1 : under beneath below; 2 : at a lower rank or secondary level.

Attached to verbs, may denote the position or direction of an action. In compounds, may stand for sub in a prepositional phrase.

Learn these words beginning with the prefix sub, meaning "below" or "under." Want to increase your prefix power? Learn our complete set of Power Prefix lists.

sub- comes from Latin, where it has the meaning "under, below, beneath'':subsoil; subway. · sub- is also used to mean "just outside of, near'':subalpine; ...

(in nouns and adjectives) below; less than subfreezing temperatures; a subtropical (= almost tropical) climate; substandard.