15.6.2.2534
[UNDEFINED]
bracket-undefined
TOOLS EXT
Compilation:
Perform the execution semantics given below.

Execution:
( "<spaces>name ..." -- flag )

Skip leading space delimiters. Parse name delimited by a space. Return a false flag if name is the name of a word that can be found (according to the rules in the system's FIND); otherwise return a true flag. [UNDEFINED] is an immediate word.

Implementation:
: [UNDEFINED] BL WORD FIND NIP 0= ; IMMEDIATE