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.