Standard Lemma guide

laetrile

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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1

noun

Meaning 1

A drug, derived from the amygdalin of apricot kernels, once thought capable of destroying cancer cells by the release of cyanide but later banned in the United States by the FDA.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a substance derived from amygdalin; publicized as an antineoplastic drug although there is no supporting evidence

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: amygdalin

History

Etymology

A contraction of l-mandelonitrile, from Ancient Greek ἀμυγδάλη (amugdálē, “almond”) + -o- + nitrile.