- grandmother, female equivalent of
- (colloquial) old woman
- (Mexico) A kind of flying ant. (clarification of this definition is needed)
The noun abuelo is like most Spanish nouns with a human referent. The masculine forms are used when the referent is known to be male, a group of males, a group of mixed or unknown gender, or an individual of unknown or unspecified gender. The feminine forms are used if the referent is known to be female or a group of females.