cross-shaped; cruciform
Describes something shaped like a cross. Often used in technical or descriptive contexts.
The church has a cruciform floor plan.
The flowers of this plant bloom in a cross shape.
十字形 is a more common noun meaning 'cross shape', while 十字架状 specifically refers to the shape of a Christian cross and is used as an adjectival noun.
Compound of 十字架 (cross, especially Christian cross) + 状 (shape, form). The reading じゅうじかじょう follows standard on'yomi.