Definitions

1. noun

A weak or feeble person, especially one who is not physically robust or is lacking in courage or determination.

“He was often teased for being a mooncalf, unable to keep up with his peers in sports.”

2. noun

A calf born too early or prematurely, often weak and unable to walk or stand.

“The veterinarian examined the mooncalf, advising its owner to seek additional care.”