Definition of plastid in English:

plastid

Syllabification: plas·tid
Pronunciation: /ˈplastid
 
/

noun

Botany
Any of a class of small organelles, such as chloroplasts, in the cytoplasm of plant cells, containing pigment or food.
More example sentences
  • These protoplasts had a thick cytoplasm with numerous plastids and mitochondria.
  • Sieve-tube members are also living cells in leaves, and contain plastids but not chloroplasts.
  • In general, stromules are more abundant in tissues containing non-green plastids, and in cells containing smaller plastids.

Origin

late 19th century: from German, based on Greek plastos 'shaped'.

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Pronunciation: ˌmɪdəˈlɛs(ə)nt
adjective
middle-aged, but still maintaining youthful interests and activities