Three separate headwords in the corpus mean, in whole or in part, "wife" — and the corpus assigns each of them a different gender, with no semantic logic behind the assignment at all:
दार is grammatically masculine — and, distinctly, it has no singular or dual at all: the corpus's own paradigm is blank in those columns, and only the plural is ever attested, so "my wife" is necessarily , plural in form, one person in fact. कलत्र is neuter — and the corpus's own gloss lists a second, unrelated sense first (, "the waist" and "the wife"), so even within one headword, gender does not track meaning consistently. भार्या is the one that is feminine, declining exactly like रमा on page 5 — but it is one choice out of three the language actually makes, not the only one available.