tentorium /ten-tōˈri-əm, -töˈ/

1. A sheet of the dura mater stretched between the cerebrum and the cerebellum (anatomy)
2. The internal chitinous skeleton of an insect's head

• hard-handed
• hard hat
• hard hats
• hardhead
• hard-headed
• hardheads
• hard-hearted
• hard-heartedly
• hard-heartedness
• hard hit
• hard-hit
• hard-hitting
• hard house
• hardier
• hardiest
• hardihead
• hardiheads
• hardihood
• hardihoods
• hardily
• hardiment
• hardiments
• hardiness
• hardinesses
• hardish