The peacock's long, iridescent tail is a classic secondary sex characteristic that helps attract mates.

Clinicians monitor secondary sex characteristics to assess the stages of pubertal development.

In the seventeenth-century diary, the author's frequent use of sombre images became his most notable characteristick.

The poet's characteristick style set him apart from his contemporaries.

The characteristicalness of her storytelling made every story instantly recognizable.

The manual described the characteristicks of the device, including durability, power consumption, and weight.