Phrase guide
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noun
A condensing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the "spot"), and used in darkfield illumination.
Definition source: English Wiktionary via Wiktextract
Qualifier: microscopy
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
No etymology was provided for this word.
