The Collaborative International Dictionary
lawn billiards
Troco \Tro"co\, n. An old English game; -- called also lawn billiards.
Wiktionary
lawn billiards
n. A lawn game related to croquet, played with heavy balls, large-headed cues called tacks, rings (the argolis or port), and sometimes an upright pin (the sprigg or king), popular from the 17th century to the early 20th century.