(anatomy) Of or pertaining to the tail and the inside (nearest the middle) of an organ etc

someone who gives a pledge

A unit of length equal to 3 feet in the US customary and British imperial systems of measurement, equal to precisely 0.9144 m since 1959 (US) or 1963 (UK).

(mining) A miner who was paid a percentage of the value of whatever ore he mined.