Adjective
That includes the lowest possible kicker cards for a given hand; as opposed to rough or rag.
ADDITIONAL INFORMATION: Example: In Ace-to-Five lowball, a hand of seven could be made with any of several possible combinations, 7-6-5-4-2, 7-6-5-4-A, 7-6-5-3-2, 7-4-3-2-A and many others. 7-4-3-2-A is the best seven because it uses the lowest possible cards, and would therefore be a perfect seven. 7-6-5-4-A would be a rag seven because it uses several of the higher cards that would still be referred to by the same rank.
SAMPLE HAND:

EXAMPLE: "We were playing Ace-to-Five draw lowball. I drew one and got lucky, making a perfect Six. I didn't think my opponent made a Wheel, so I played my hand pretty aggressively after I hit."
APPLIES TO: Online and Land-based Venues
USAGE: Describes a lowball hand.
SYNONYMS: Smooth
ANTONYMS: Rag, Rough
RELATED TERMS: Kansas City, Lowball
Adjective
That is the one specific card on the river or two specific cards together between the turn and the river required for a specified player to win the showdown.
EXAMPLE: "I needed a perfect runner to win, but I didn't hit it."
APPLIES TO: Online and Land-based Venues
USAGE: Describes a card or group of cards.
SYNONYMS: Case
RELATED TERMS: River Rat, Runner, Runner-Runner