グレフルグレフルMeanings1noungrapefruitabbreviationCasual abbreviation of グレープフルーツ, used in everyday conversation and informal writing.See also: グレープフルーツ朝あさはグレフルジュースを飲のむ。I drink grapefruit juice in the morning.グレフルって、ちょっと苦にがいけど好すき。Grapefruit is a bit bitter, but I like it.