capsule – n. a very small container that is filled with medicine and swallowed whole

acidic – adj. of or related to the qualities of an acid

parasite – adj. of or related to an animal or plant that lives in or on another animal or plant and gets food or protection from it

transiently – adv. not lasting long

region – n. a part of a country, of the world, etc., that is different or separate from other parts in some way

gradually – adv. moving or changing in small amounts; happening in a slow way over a long period of time

dissolve – v. to mix with a liquid and become part of the liquid
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