acrostichoid

As an adjective acrostichoid

is (botany|of a fern) whose sori densely cover the underside of the frond like a felt, without visible gaps between them.

As a noun null is

zero, nil; the cardinal number before einn.

As a noun terms

is .

As an adjective acrostichoid is

(botany|of a fern) whose sori densely cover the underside of the frond like a felt, without visible gaps between them.

As a verb felt

is to fear something.

As an adjective acrostichoid is

(botany|of a fern) whose sori densely cover the underside of the frond like a felt, without visible gaps between them.

As a noun frond

is (botany) the leaf of a fern, especially a compound leaf.

As an adjective acrostichoid is

(botany|of a fern) whose sori densely cover the underside of the frond like a felt, without visible gaps between them.

As a noun underside

is the side that is below or underneath, the bottom.

As an adjective acrostichoid is

whose sori densely cover the underside of the frond like a felt, without visible gaps between them.

As a proper noun fern

is (female) from the fern plant.

As an adjective acrostichoid is

(botany|of a fern) whose sori densely cover the underside of the frond like a felt, without visible gaps between them.