What is "metacaspase"

n. Any of a class of arginine/lysine-specific enzymes related to the caspases and paracaspases, and found in plants, fungus, and protists.

Metacaspases are members of the C14 class of cysteine proteases and thus related to caspases, orthocaspases and paracaspases. The metacaspases are Arginine/ Lysine-specific, in contrast to caspases, which are Aspartate-specific.