1. n. (also h) (pl. Hs or H's)
1. the eighth letter of the alphabet (see AITCH).
2 anything having the form of an H (esp. in comb.: H-girder). 2. abbr. (also H.)
1. hardness.
2 (of a pencil-lead) hard.
3 henry, henrys.
4 (water) hydrant.
5 sl. heroin. 3.
symb. Chem. the element hydrogen.