Within a cavity

(organic chemistry) (+)-2,3alpha,3aalpha,7a-Tetrahydro-7aalpha-hydroxy-8-(4-hydroxy-3-methoxyphenyl)-4-(3alpha,5,7-trihydroxy-4-oxo-2beta-chromanyl)-3,6-methanobenzofuran-7(6alphaH)-one, one of the...

(uncountable) The state or property of being hypothetical. / (countable) Something of hypothetical nature.

One of three equals parts (1/3, ⅓, 0.333…).