On grammatical class:

convert selbri to mex operand; used to create new non-numerical quantifiers; e.g. "herd" of oxen.

In definition:

x1 is the selma'o "NIhE".

In notes:

ci zei mektika
x1 is a part of Lojban text representing rule 'operand-3' according to the first edition of the book 'The Complete Lojban Language'.