Phrase guide

molecular weight

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

The sum of the atomic weights of every atom in a molecule.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

(chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: relative molecular mass

Antonyms: none provided

Broader terms: mass

History

Etymology

No etymology was provided for this word.

Across languages

Translations

13 source translations are retained for this English entry.

  • Chinese Cantonese: 分子量 (fan6 zi2 loeng6) — the sum of the atomic weights of every atom in a molecule
  • Chinese Mandarin: 分子量 (fēnzǐliàng) — the sum of the atomic weights of every atom in a molecule
  • Finnish: molekyylipaino — the sum of the atomic weights of every atom in a molecule
  • French: masse moléculaire — the sum of the atomic weights of every atom in a molecule
  • German: Molekulargewicht — the sum of the atomic weights of every atom in a molecule
  • Greek: μοριακό βάρος (moriakó város) — the sum of the atomic weights of every atom in a molecule
  • Hungarian: molekulatömeg — the sum of the atomic weights of every atom in a molecule
  • Italian: massa molecolare — the sum of the atomic weights of every atom in a molecule
  • Italian: peso molecolare — the sum of the atomic weights of every atom in a molecule
  • Romanian: masă moleculară — the sum of the atomic weights of every atom in a molecule
  • Romanian: greutate moleculară — the sum of the atomic weights of every atom in a molecule
  • Spanish: peso molecular — the sum of the atomic weights of every atom in a molecule
  • Tagalog: mulatling bugat — the sum of the atomic weights of every atom in a molecule