Pronunciation: ' th ī -l ə - ˌ ko ̇ id
Function: noun
Etymology: International Scientific Vocabulary thylak- (fr. Greek thylakos sack) + -oid
Date: 1962
: any of the membranous disks of lamellae within plant chloroplasts that are composed of protein and lipid and are the sites of the photochemical reactions of photosynthesis