nb

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
noun a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something

The NBS establishes exactly what the time is, to the nearest millionth of a millionth of a second. — Terminal Compromise, Winn Schwartau
LET none because of its abundant locks, Deceive themselves by thinking for a minute, That dandy E--nb----h's "knowledge-box" Has anything worth larceny within it. — The Jest Book: The Choicest Anecdotes and Sayings, Mark Lemon

niobium, atomic number 41

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