“The people who are reacting to that word are not reading the book as a whole,” she said. “That’s what censors do — they pick out words and don’t look at the total merit of the book.”

If it were any other novel, it probably would have gone unnoticed, unordered and unread. But in the world of children’s books, winning a Newbery is the rough equivalent of being selected as an Oprah’s Book Club title. Libraries and bookstores routinely order two or more copies of each year’s winners, with the books read aloud to children and taught in classrooms.

“The Higher Power of Lucky” was first published in November by Atheneum/Richard Jackson Books, an imprint of Simon & Schuster, accompanied by a modest print run of 10,000. After the announcement of the Newbery on Jan. 22, the publisher quickly ordered another 100,000 copies, which arrived in bookstores, schools and libraries around Feb. 5.

Reached at her home in Los Angeles, Ms. Patron said she was stunned by the objections. The story of the rattlesnake bite, she said, was based on a true incident involving a friend’s dog.

And one of the themes of the book is that Lucky is preparing herself to be a grown-up, Ms. Patron said. Learning about language and body parts, then, is very important to her.

“The word is just so delicious,” Ms. Patron said. “The sound of the word to Lucky is so evocative. It’s one of those words that’s so interesting because of the sound of the word.”

Image Susan Patron, the author of the book and a librarian, said the controversial word was just part of the characters learning about body parts. Credit... Alex Koester for The New York Times

Ms. Patron, who is a public librarian in Los Angeles, said the book was written for children 9 to 12 years old. But some librarians countered that since the heroine of “The Higher Power of Lucky” is 10, children older than that would not be interested in reading it.