ox-heart
/ˈɒkshɑːt/noun
1The heart of an ox, especially as an article of food.
2Any of various varieties of fruit or vegetable characteristically forming a heart-shaped fruit, head, root, etc.
3Now chiefly North American. More fully ox-heart cherry. Any of several large, heart-shaped varieties of cherry; the tree bearing such fruit.
4In full ox-heart clam, ox-heart shell. Any of several large, heart-shaped bivalve molluscs, especially the heart cockle, Glossus humanus.
Origin
Late 17th century; earliest use found in English Historical Review. From ox + heart interjection adverb.