Entry 3 senses · 2 variants Webster, 1913 Tardigrade · Tar·di·grade · IPA /ˈtɑɹdɪˌɡɹeɪd/ a. n. 01 a. Moving or stepping slowly; slow-paced. 1. Moving or stepping slowly; slow-paced.[R.] 2. Of or pertaining to the Tardigrada.(Zool.) 02 n. One of the Tardigrada. 1. One of the Tardigrada.(Zool.)