Wiktionary
silacyclobutane
n. (context organic compound English) A saturated heterocycle having three carbon atoms and one silicon atom; any derivative of this compound
Wikipedia
Silacyclobutane
Silacyclobutane is a organosilicon compound with the formula (CH)SiH. It is a colourless volatile liquid of only academic interest. More common derivatives include the disubstituted derivatives such as (CH)Si(CH). Being strained rings, such compounds exhibit enhanced reactivity.