From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: Articulations may be immovable, when the bones are directly united (synarthrosis), or slightly movable, when they are united intervening substance (amphiarthrosis), or they may be more or less freely movable, when the articular surfaces are covered with synovial membranes, as in complete joints (diarthrosis). The last (diarthrosis) includes hinge joints, admitting motion in one plane only (ginglymus), ball and socket joints (enarthrosis), pivot and rotation joints, etc.
2. (Bot.) (a) The connection of the parts of a plant by joints, as in pods. (b) One of the nodes or joints, as in cane and maize. (c) One of the parts intercepted between the joints; also, a subdivision into parts at regular or irregular intervals as a result of serial intermission in growth, as in the cane, grasses, etc. --Lindley.
From WordNet (r) 3.0 (2006) [wn]:
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