TWIN
ADJECTIVES
1497 — GEMEL twin → obs.
1598 — GEMINATE duplicated, combined in pairs, twin
1727 — GEMELLIPAROUS producing twins → obs.
NOUNS
1413 — DOUBLES two of the same kind; twins → obs.
NOUNS, PERSON
1382 — GEMELLES — GEMELS — GEMMELS — GEMEWS — GEMOWS twins; said also of things associated in pairs → obs.
1382 — TWINLING a twin → obs. exc. Eng. dial.
1526 — TWINDLE a twin → obs. exc. Eng. dial.
1580 — TWAINS twins → Eng. dial.
..19C — PIGEON-PAIR twins of the opposite sex → Brit. sl.
1870 — BIRTH PARTNER a person born at the same time as another, a twin
1890 — PHILLERPENER — PHILOPENA a twin → Amer. dial.
1914 — YAMMALDS twins → Sc. (Bk.)
1998 — NEEDLES AND PINS twins → UK rhyming sl.
VERBS
1845 — TWINDLE to bring forth twins → Eng. dial.
Lexicophilia 