v. t. & i. To act or treat as a monkey does; to ape; to act in a grotesque or meddlesome manner. [ 1913 Webster ]

To monkey with,
To monkey around with, to handle in a meddlesome manner. [ Colloq. ] [ 1913 Webster +PJC ]

n.; pl. Monkeys [ Cf. OIt. monicchio, It. monnino, dim. of monna an ape, also dame, mistress, contr. fr. madonna. See Madonna. ] 1. (Zool.) (a) In the most general sense, any one of the Quadrumana, including apes, baboons, and lemurs. (b) Any species of Quadrumana, except the lemurs. (c) Any one of numerous species of Quadrumana (esp. such as have a long tail and prehensile feet) exclusive of apes and baboons. [ 1913 Webster ]

☞ The monkeys are often divided into three groups: (a) Catarrhines, or Simidae. These have an oblong head, with the oblique flat nostrils near together. Some have no tail, as the apes. All these are natives of the Old World. (b) Platyrhines, or Cebidae. These have a round head, with a broad nasal septum, so that the nostrils are wide apart and directed downward. The tail is often prehensile, and the thumb is short and not opposable. These are natives of the New World. (c) Strepsorhines, or Lemuroidea. These have a pointed head with curved nostrils. They are natives of Southern Asia, Africa, and Madagascar. [ 1913 Webster ]

2. A term of disapproval, ridicule, or contempt, as for a mischievous child. [ 1913 Webster ]

This is the monkey's own giving out; she is persuaded I will marry her. Shak. [ 1913 Webster ]

3. The weight or hammer of a pile driver, that is, a very heavy mass of iron, which, being raised on high, falls on the head of the pile, and drives it into the earth; the falling weight of a drop hammer used in forging. [ 1913 Webster ]

4. A small trading vessel of the sixteenth century. [ 1913 Webster ]

Monkey boat. (Naut.) (a) A small boat used in docks. (b) A half-decked boat used on the River Thames. --
Monkey block (Naut.), a small single block strapped with a swivel. R. H. Dana, Jr. --
Monkey flower (Bot.), a plant of the genus Mimulus; -- so called from the appearance of its gaping corolla. Gray. --
Monkey gaff (Naut.), a light gaff attached to the topmast for the better display of signals at sea. --
Monkey jacket, a short closely fitting jacket, worn by sailors. --
Monkey rail (Naut.), a second and lighter rail raised about six inches above the quarter rail of a ship. --
Monkey shine, monkey trick. [ Slang, U.S. ] --
Monkey trick, a mischievous prank. Saintsbury. --
Monkey wheel. See Gin block, under 5th Gin. [ 1913 Webster ]

n. (Bot.) The fruit of the Adansonia digitata; also, the tree. See Adansonia. [ 1913 Webster ]

n. (Bot.) See Nepenthes. [ 1913 Webster ]

n. large ornamental tropical American tree (Albizia saman) with bipinnate leaves and globose clusters of flowers with crimson stamens and sweet-pulp seed pods eaten by cattle.
Syn. -- rain tree, saman, zaman, zamang, Albizia saman. [ WordNet 1.5 ]

n. (Zool.) The fruit of two South American trees (Lecythis Ollaria, and Lecythis Zabucajo), which have for their fruit large, pot-shaped, woody capsules containing delicious nuts, and opening almost explosively by a circular lid at the top. Vases and pots are made of this capsule. [ 1913 Webster ]

(Bot.) A lofty coniferous Chilian tree (Araucaria araucana, formerly Araucaria imbricata), the branches of which are so crowded and intertwisted “as to puzzle a monkey to climb.” It is also called monkey puzzle and monkey puzzle tree. The edible nuts are over an inch long, and are called piñon by the Chilians. [ 1913 Webster ]

n. (Naut.) A short, round iron bar or lever used in naval gunnery. Totten. [ 1913 Webster ]

n. A wrench or spanner which has one fixed and one adjustable jaw.
Syn. -- monkey wrench. [ WordNet 1.5 ]

. A jar or bottle, as of porous earthenware, in which water is cooled by evaporation. [ Webster 1913 Suppl. ]