A Grammatical Dictionary of Botanical Latin

Thylakoid: thylakoides,-is (s.f.III), acc. sg. thylakoidem, dat. sg. thylakoidi, abl. sg. thylakoide, nom. & acc. pl. thylakoides, gen. pl. thylakoidium, dat. & abl. pl. thylakoidibus; cf. pyrenoid;

- pyrenoide unica in forma reticulata e intrusionibus thylacoidium composita, with one pyrenoid in a reticulate pattern composed of intrusions of thylakoids.

- matrix pyrenoidis thylacoidibus pluribus penetrata, matrix of the pyrenoid penetrated by many thylakoides.

Note: this word is an i-stem like ‘nubes,-is (s.f.III) ‘cloud’, hence, the genitive plural ends in -ium (not -um, as is typical of third declension nouns).

Note: in English the ‘k’ is retained, but when Latinized, the ‘k’ becomes a ‘c’.

Note: Wikipedia (Dec. 2011): “A thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. The word "thylakoid" is derived from the Greek thylakos, meaning "sac". Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen. Chloroplast thylakoids frequently form stacks of disks referred to as "grana" (singular: granum). Grana are connected by intergrana or stroma thylakoids, which join granum stacks together as a single functional compartment.”

Thylacoid membrane: membrana,-ae (s.f.I) thylacoidis (gen.sg.).

Thylacoid lumen: lumen,-inis (s.n.III) thylacoidis (gen.sg.), abl. sg. lumine thylacoidis.

Granum,-e (s.n.II), abl. sg. grano.

Chloroplast thylakoid: thylacoides (s.f.III) chloroplasti (gen.sg.), gen.sg. thylacoidis chloroplasti, abl. sg. thylacoide chloroplasti; thylacoides chloroplastica (adj.A), abl. sg. thylacoide chloroplastica.

Intergranal thylakoid: thylacoides intergraneus (adj.A), abl. sg. thylocoide intergranea; thylacoides intergranalis (adj.B), abl. sg. thylacoide intergranali.

- Stroma thylakoid: thylacoides stromatica (adj.A), abl. sg. thylacoide stromatica.