per·i·clase 
(pĕrĭ-klās′, -klāz′)
(pĕrĭ-klās′, -klāz′)n.
A mineral form of magnesium oxide, MgO, usually occurring in cubic crystals or grains.
[German Periklas : Greek peri-, intensive pref.; see PERI- + Greek klasis, breaking (from its perfect cleavage); see ORTHOCLASE.]
- jump bid
- jump bones
- jump cut
- jumper
- jumper
- jumper cable
- jump/go through the hoop
- jump hook
- jumpiness
- jumping bean
- jumping gene
- jumping jack
- jumping mouse
- jumping-off place
- jumping plant louse
- jump jet
- jump-off
- jump out
- jump rope
- jump seat
- jump shooter
- jump shot
- jump/skip bail
- jump (someone's) bones
- jump someone's bones