Grapefruit
2 of the 7 encyclopedias on this shelf carry an entry for Grapefruit. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
A VALUABLE PRODUCT IN FLORIDA AND OTHER SOUTHERN STATES Publishers' Photo Service CITY OF ATHENS, AS SEEN FROM THE ACROPOLIS Publishers' Photo Service Photo by Ewing Galloway VESSELS LOADING AT CLEVELAND, OHIO, WITH A CARGO OF STEEL RAILS, WHICH WILL BE UNLOADED AT A CANADIAN PORT ON LAKE SUPERIOR Photo, Colonial Press HARBOR OF FORT WILLIAM, HEAD OF CANADIAN NAVIGATION ON LAKE SUPERIOR AND GRAIN PORT FOR THE CANADIAN WEST British and Colomal Press CONSTRUCTION ON THE NEW WELLAND CANAL, AT HOMER. WIDTH, 80 FEET; GATES COMPLETED, 81.6 FEET HIGH murderer of Chosrov I., King of Armenia. For this crime the whole family was slain save himself. He owed his escape to a Christian nurse, who secretly conveyed to Cæsarea him,, in when Cappadocia he was, 2 town. He there married a who bore him two sons, and soon afterward became a nun. Gregory proceeded to Rome, and entered the service of Terdat, Chosrov's son. After Terdat (Tiridates III.) had, with the help of the Romans, recovered his father's kingdom (286), Gregory, for his refusal to crown with garlands the statue of Anahit, tutelary goddess of Armenia, was thrown by Terdat into a deep pit, where a pious widow nourished him for 14 years. About the end of that time Terdat was visited with the punishment of Nebuchadnezzar. Healed and baptized by Gregory, he became a zealous Christianity by Christian force, throughout and Gregory was dominions. bishop and head of the Armenian by Leontius, Archbishop of Cæsarea. Having resigned the patriarchate in favor of his second son Aristaces, Gregory in 331 retired to a cave at the foot of Mount Sebuh in Upper Armenia, where he died in 332.
Aiton's Encyclopedia (1910)
a dessert fruit, having the shape of an orange with the sourness and color of a mild lemon. The grapefruit is considerably larger than the orange. Its only claim to the name lies in the large clusters in which it hangs on the tree. A native of southeastern Asia, now cultivated in India, Florida, the West Indies , and California. The tree is somewhat larger than the orange tree. It requires much the same treatment but it is even more sensitive to frost. In Florida the fruit is known as the pomelo. The grapefruit is related to the lemon and the orange but it is not a cross between them. See Lemon ; Orange