Spriends is the plural of spriend, which is a person with whom you do sports, share your sport experiences, visions and goals. Spriends are different from regular friends as the topic of communication between the two people is restricted to or dominated by sports.
A superlative or very special and important form of a friend or friendship bond made in the early devcelopmental years by two pre-pubescent girls. This word goes beyond BFF. It is the "bestest" type of friendship one can have.
Spriends are people with whom you do sports. A spriend is someone with whom you can talk for hours on end about your sport, your experiences and your goals. Spriends are hard to reach and chat to on facebook or any public platform where they are mixed with your friends who usually couldn't care less about your MTB whipe-out or your new climbing rope.
Sister's friend - the relationship between your sister's close friend and yourself. Usually used when you have a close bond with you sisters friend as well - but not quite a friendship.