Any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber WordNet 3.0 & Open English WordNet

Tree member of the Tilia genus, itself member of the Malvaceae family, of quick growth, able to reach 30 or 40 m high, with a sturdy trunk, numerous ramifications, usually heart-shaped leaves, tiny fruits attached to a ribbon-like, greenish-yellow bract, 5-petaled 5-sepaled flowers, both the flower and the bract being used in medicinal tea. OmegaWiki

Any of several trees of the genus Tilia; the lindens, especially Tilia americana, the American basswood. Wiktionary

Linden. Wiktionary (translation)

A deciduous tree of the genus Tilia, especially Tilia × europaea; the linden tree, or its wood. Wiktionary

Any of various deciduous trees of the genus Tilia, having heart-shaped leaves. Wiktionary