n (US) Any of several North American plane trees, of the genus Platanus, especially (taxlink|Platanus occidentalis|species) (American sycamore).
n (British) A large British and European species of maple, Acer pseudoplatanus, known in North America as the sycamore maple.
n A large tree bearing edible fruit, Ficus sycomorus, allied to the common fig and found in Egypt and Syria; also called the sycamore fig or the fig-mulberry; the Biblical sycomore.