During the lecture, the professor sketched the helvetane structure on the board to illustrate its cross-shaped geometry.

The helvetanes gathered at dawn to defend their mountain passes.

The designer chose Helvetica for the company's new logo to give it a clean, modern feel.

We hiked up Helvellyn at sunrise and watched the valleys below glow with morning light.

Field mycologists confirmed that the specimens were helvellaceous, characterized by saddle-shaped caps and brittle stems.

Laboratory tests showed that helvellic acid rapidly lyses red blood cells at micromolar concentrations.

The helvellic compound showed promising antimicrobial activity in preliminary tests.