-d

suffix

1. Alternative form of -ed now only standard with words which end in -e, but historically permissable in all the same places as -ed.

   “bone → boned, pirouette → pirouetted, learn → learnd”

2. An empty suffix, perhaps derived from the past-tense suffix above, added in some dialects to the present tense forms of some words which then add an additional -ed in the past tense.

   “damn → damnd (→ damnded), drown → drownd (→ drownded)”

3. Marks ordinals written in digits when the final term of the spelled number is "second" or "third"

   “2d grade; 23d century”