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| IN-AND-OUT | A term sometimes used for the scantline [sic] of the timbers, the moulding way, and particularly for those bolts that are driven into the hanging and lodging knees, through the sides, which are called in-and-out bolts. Also descriptive of the motion of the Parson's membrum virile. |
| INNER-POST | A piece brought on at the fore side of the main-post, and generally continued as high as the wing-transom, to seat the other transoms upon. |
| IRONS | A ship is said to be in irons, when, in working, she will not cast one way or the other. |
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