I. |parə|sen.trik adjective
Etymology: para- (I) + -centric
1. : being a type of key and keyway used with pin-tumbler cylinder locks and having longitudinal ribs and grooves projecting beyond the center to hinder picking
2. : being an inversion that occurs in a single arm of one chromosome and does not involve the chromomere — compare pericentric
II. noun
( -s )
: a paracentric key or keyway