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The Collaborative International Dictionary
ajwain

Ajouan \Aj"ou*an\ ||Ajowan \Aj"ow*an\, n. [Written also ajwain.] [Prob. native name.] (Bot.) The fruit of Ammi Copticum, syn. Carum Ajowan, used both as a medicine and as a condiment. An oil containing thymol is extracted from it. Called also Javanee seed, Javanese seed, and ajava.

Wiktionary
ajwain

n. A plant in the family Apiaceae ((taxlink Trachyspermum ammi species noshow=1)), and its seed, which is used (especially in South Asian cooking) for its thyme-like flavor.

Wikipedia
Ajwain

Ajwain, ajowan Trachyspermum ammi, also known as Ajowan caraway, bishop's weed or carom, is an annual herb in the family Apiaceae. It originated in India. Both the leaves and the fruit (often mistakenly called seeds) of the plant are consumed by humans. The plant is also called bishop's weed, but this is a common name it shares with some other different plants. The "seed" (i.e., the fruit) is often confused with lovage "seed". Ajwain is known as അയമോദകം in Malayalam and ஓமம் in Tamil.