297.

Note the use of the words dvayam and trayam, or dvitayam and tritayam = »couple” and »triad;” »tetrad” is catuṣṭayam. They are often the last members of compounds. M. 2, 76 vedatrayam (the three Vedas), Utt. III, p. 37 tataḥ praviśati nadīdvayaṃ tamasā maralā ca.

297. dvayam等

dvayam（/ dvitayam; 2つの, couple）とtrayam（/ {tritayam; 3つの, triad）、catuṣṭayam（4つの, tetrad）…などの語の使用に注意せよ。これらはしばしば合成語の最後の要素となる。
M. 2, 76 vedatrayam (the three Vedas)
Utt. III, p. 37 tataḥ praviśati nadīdvayaṃ tamasā maralā ca