Entry 1 sense Webster, 1913 Catheterize · Cath·e·ter·ize · IPA /ˈkæθətəɹaɪz/ 01 v. t. To operate on with a catheter. imp. & p. p. Catheterized; p. pr. & vb. n. Catheterizing 1. To operate on with a catheter.(Med.)