abnormal individual exhibiting secondary characters of both sexes. particularly well known in insects; occurs also in Crustacea, birds, and mammals.

An individual in which male and female parts develop simultaneously. The resulting individual may be referred to as a sexual mosaic, i.e., showing both male and female characteristics. If, as is commonly the case, the two sides of an organism differ in sex, the individual is referred to as a bilateral gynandromorph.

A gynandromorph is an organism that contains both male and female characteristics. The term gynandromorph, from Greek "gyn" female and "andro" male, is mainly used in the field of Lepidopterology (butterfly/moth study) or entomology (all insects). These characteristics can be seen in butterflies, where both male and female characteristics can be seen physically because of sexual dimorphism.