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The Collaborative International Dictionary
Receptaculum

Receptaculum \Rec`ep*tac"u*lum\ (r[e^]s`[e^]p*t[a^]k"[-u]*l[u^]m), n.; pl. Receptacula (r[e^]s`[e^]p*t[a^]k"[-u]*l[.a]). [L.] (Anat.) A receptacle; as, the receptaculum of the chyle.

Wiktionary
receptaculum

n. (context anatomy English) A receptacle.