Agenothree: A common chemical on Pern, HNO3

Between: An area of nothingness between here and there.

Black Rock: Coal

Day Sisters: A trio of stars visible from Pern

Dawn Sisters: See Day Sisters

Deadglow: Insult meaning idiot

Fellis: A flowering tree

Fellis juice: A juice made from the fruit of the fellis tree; A soporific

Fire-stone: Phosphine-bearing mineral dragons chew to produce flame

Glow: A light-source which can be carried in a handbasket

High Reaches: Mountains on the northern continent of Pern

Hold: A place where the commoners live

Impression: The joining of minds of a dragon and his rider-to-be at themoment of the dragon's hatching

Interval: The period of time between passes, generally 200 turns

Klah: A hot stimulating drink made of tree bark and tasting faintly of cinnamon

Looks to: Is Impressed by

Long Interval: A period in time, generally twice the length of an interval, in which no Thread falls and Dragonmen decrease in number

Numbweed: A medical cream which, when smeared on wounds, kills all feeling; used as an anesthetic

Pass: A period of time during which the Red Star is close enough to drop thread on Pern

Red Star: Pern's stepsister planet. It has an erratic orbit

Rukbat: Pern's sun

Thread: Spores from the Red Star, which descend on Pern and burrow into it, devouring all organic material they encounter

Turn: A Pernese year

Watch-wher: A nocturnal reptile distantly related to dragonkind

Weyr: A home of dragons and their riders

weyr: A dragon's den

Weyrsinger: The Harper for dragonriders, usually a rider himself

Wherries: A type of fowl roughly resembling the turkey of Earth, but Ostritch sized