'Trim of the masts' definitions:

Definition of 'Trim of the masts'

From: GCIDE

Trim \Trim\, n.
1. Dress; gear; ornaments. [1913 Webster]
Seeing him just pass the window in his woodland trim. --Sir W. Scott. [1913 Webster]
2. Order; disposition; condition; as, to be in good trim. " The trim of an encounter." --Chapman. [1913 Webster]
3. The state of a ship or her cargo, ballast, masts, etc., by which she is well prepared for sailing. [1913 Webster]
4. (Arch) The lighter woodwork in the interior of a building; especially, that used around openings, generally in the form of a molded architrave, to protect the plastering at those points. [1913 Webster]
In ballast trim (Naut.), having only ballast on board. --R. H. Dana, Jr.
Trim of the masts (Naut.), their position in regard to the ship and to each other, as near or distant, far forward or much aft, erect or raking.
Trim of sails (Naut.), that adjustment, with reference to the wind, witch is best adapted to impel the ship forward. [1913 Webster]