- diacle
- diagonal braces
- diagonal ribband
- diagonals
- diagonal trussing
- diameter
- diameter, apparent
- diamond-cut
- diamond-knot
- dibbs
- dice
- dichotomized
- dickadee
- dick-a-dilver
- dicker-work
- dickey
- diddle, to
- diego
- die on the fin, to
- diet
- difference
- difference of latitude
- difference of longitude
- differential observation
- difficulty
- dight
- digit
- dike
- dill
- dillosk
- dilly-wreck
- dime
- diminished angle
- diminishing plank
- diminishing strakes
- diminishing stuff
- diminution of obliquity
- dimsel
- ding, to
- ding-dong
- dinghey
- dingle
- dinnage
- dip
- dip, to
- dip of the horizon
- dipped
- dipper
- dipping-ladle
- dipping-needle
- dipping-net
- dips
- dip-sector
- dipsy
- direct-acting engine
- direct fire
- st of the of the wind and current
- set of the wind and current
- direction or set of the wind and current
- direction
- direct motion
- dirk
- dirt-gabard
- dirty aulin
- dirty dog and no sailor
- disabled
- disappoint
- disarm
- disbanded
- disk
- disc
- discarcare
- discharged
- discharge-ticket
- discharge-valve
- disciplinarian
- discourse, to
- discovery ship
- discretion
- disembark
- disembay
- disembogue
- disguise
- dish, to
- dislodge
- di-slyng
- dismantled
- dismasted
- dismiss
- dismission
- dismount, to
- dismounted
- disobedience
- disorder
- disorganize, to
- throw of the shot
- dispart, or throw of the shot
- disparting a gun
- dispart-sight
- dispatch