trunk (n.1)

mid-15c., "box, case," from Old French tronc "alms box in a church," also "trunk of a tree, trunk of the human body, wooden block" (12c.), from Latin truncus "trunk of a tree, trunk of the body," of uncertain origin, probably originally "mutilated, cut off," and perhaps from PIE root *tere- (2) "cross over, pass through, overcome."

The meaning "box, case" is likely to be from the notion of the body as the "case" of the organs. English acquired the "main stem of a tree" and "torso of the body" senses from Old French in late 15c. The sense of "luggage compartment of a motor vehicle" is from 1930. Railroad trunk line is attested from 1843; telephone version is from 1889.

trunk (n.2)

"elephant's snout," 1560s, apparently from trunk (n.1), perhaps from confusion with trump (n.2), short for trumpet.

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Definitions of trunk

trunk (n.)
the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber;
Synonyms: tree trunk / bole
trunk (n.)
luggage consisting of a large strong case used when traveling or for storage;
trunk (n.)
compartment in an automobile that carries luggage or shopping or tools;
he put his golf bag in the trunk
Synonyms: luggage compartment / automobile trunk / boot
trunk (n.)
a long flexible snout as of an elephant;
Synonyms: proboscis
trunk (n.)
the body excluding the head and neck and limbs;
Synonyms: torso / body