The Collaborative International Dictionary
Collegatary
Collegatary \Col*leg"a*ta*ry\, n. [L. collegetarius. See Legatary.] (Law) A joint legatee.
Wikipedia
Collegatary
In civil law, a collegatary is a person to whom is left a legacy, as imparted by a will, in common with one or more other individuals; so called as being a joint legatary, or co-legatee.