A Grammatical Dictionary of Botanical Latin

Unda,-ae (s.f.I): a wave or the waves (of the sea); wave, billow, surge, the motion peculiar to liquids; water, moisture; tide, stream; the sea; sea-water; “a body of flowing water, a river, spring, etc.; running water as a source of power; the waters of a river; a flow (of liquid other than water); a flow or current (of air, etc.); water in general” (Glare); syn. fluctus,-us (s.m.IV), abl. sg. fluctu; see aestus,-us (s.m.IV);

- Hab. ad saxa trabesque ligneos saepe emersos, undarumque spuma irrigatos it dwells on stones and woody planks, often half-submerged and irrigated by the foam of the waves.

- Hab. in scrobiculis parum profundis, unda saepe superfusis soleque maxime expositis utriusque maris (Agardh), in rather deep trenches, often inundated by the tide and exposed to the maximum sun of both seas.

- Hab. ad lapides subemersos undis irroratos magis absconditos (Agardh), it grows on stones somewhat emergent, more concealed, splashed by the waves.