When a cold stiff breeze hits the nipples of breast that are not in a bra and they get erect immediately.

A term to describe very cold weather, so cold it makes your nipples hard.

When the weather outside is nippy, but you pronounced it with an extra ly at the end.

Coldness which makes your nipples stiffen.

A description of the degree of coolness of the current air temperature, related to the proportion of hardened nipples in the area.

1. To be cold/"happy" enough to have one's nipple's erect.

1. The temperature at which the nipples become hard outside.(adv.)